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The Nexus One (codenamed
HTC HTC Corporation ( zh, t=宏達國際電子股份有限公司, s=宏达国际电子股份有限公司, p=Hóngdá Guójì Diànzǐ Gǔfèn Yǒuxiàn Gōngsī, first=t) or High Tech Computer Corporation, (literally ''Hongda International Electron ...
Passion) is an Android
smartphone A smartphone is a portable computer device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, whi ...
designed and manufactured by
HTC HTC Corporation ( zh, t=宏達國際電子股份有限公司, s=宏达国际电子股份有限公司, p=Hóngdá Guójì Diànzǐ Gǔfèn Yǒuxiàn Gōngsī, first=t) or High Tech Computer Corporation, (literally ''Hongda International Electron ...
as
Google Google LLC () is an American Multinational corporation, multinational technology company focusing on Search Engine, search engine technology, online advertising, cloud computing, software, computer software, quantum computing, e-commerce, ar ...
's first
Nexus NEXUS is a joint Canada Border Services Agency and U.S. Customs and Border Protection-operated Trusted Traveler and expedited border control program designed for pre-approved, low-risk travelers. Members of the program can avoid waits at border ...
smartphone. The Nexus became available on January 5, 2010, and features the ability to transcribe voice to text, an additional microphone for dynamic noise suppression, and voice guided
turn-by-turn navigation Turn-by-turn Navigation is a feature of some satellite navigation devices where directions for a selected route are continually presented to the user in the form of spoken or visual instructions. The system keeps the user up-to-date about the best ...
to drivers. The device was sold SIM-unlocked and not restricted to use on a single network provider. Google offered
T-Mobile US T-Mobile US, Inc. is an American wireless network operator headquartered in Overland Park, Kansas and Bellevue, Washington, U.S. Its largest shareholder is a multinational telecommunications company Deutsche Telekom AG, which , holds 48.4 pe ...
and
AT&T AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile ...
versions of the phone online in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
before closing the online store in July 2010. A version for use on
Vodafone Vodafone Group plc () is a British multinational telecommunications company. Its registered office and global headquarters are in Newbury, Berkshire, England. It predominantly operates services in Asia, Africa, Europe, and Oceania. , Vod ...
(European) networks was announced on April 26, 2010, available in the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and ...
four days later. On March 16, 2010, the Nexus One became available on the Google web store (Play Store) for sale in
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...
for use with most Canadian carriers. In May 2010, Google announced the closing of the web store, with the intention to distribute the phone through partners around the world.


History

A trademark application for the name "Nexus One" was filed by
Google Google LLC () is an American Multinational corporation, multinational technology company focusing on Search Engine, search engine technology, online advertising, cloud computing, software, computer software, quantum computing, e-commerce, ar ...
Inc. on December 10, 2009. The Nexus One trademark was filed in International Trademark Class 9 for "Computer & Software Products & Electrical & Scientific Products" with description of "Mobile phones". On March 15, 2010 it was announced that the application had been declined due to the mark already being granted on December 30, 2008 to Integra Telecom. On December 12, 2009, Google confirmed in a blog post that they had begun internal testing of the device. Google stated that a "mobile lab device" had been given to its employees, at that time Google had not yet confirmed that a device would be sold to consumers. Wireless phone and data services for the device were not activated nor billed to Google; it was up to the employees to activate and pay for wireless service on their own. As of April 2010, the Nexus One had shipped to the US, the UK, Hong Kong, Germany and Singapore, although the phone was not fully localized for non-US markets – the lack of
satnav A satellite navigation or satnav system is a system that uses satellites to provide autonomous geo-spatial positioning. It allows satellite navigation devices to determine their location (longitude, latitude, and altitude/elevation) to high pre ...
outside the US, UK and Ireland, and the US English "voice keyboard" being the most obvious shortcomings. A June 2010 update saw Google Navigation being enabled for additional 11 countries.


Litigation

Upon the announcement of the Nexus One, Google received a cease-and-desist complaint by the estate of sci-fi author Philip K. Dick implying that the Nexus One namesake capitalized on intellectual property from his 1968 novel ''
Do Androids Dream of Electric Sheep? ''Do Androids Dream of Electric Sheep?'' (retroactively retitled ''Blade Runner: Do Androids Dream of Electric Sheep?'' in some later printings) is a dystopian science fiction novel by American writer Philip K. Dick, first published in 1968. Th ...
''. Isa Dick Hackett, daughter of Philip K. Dick, and several bloggers believed that the choice of name "Nexus One" as Google's first Android phone was a direct reference to the "Nexus-6" model series of androids in Dick's novel.
Apple An apple is an edible fruit produced by an apple tree (''Malus domestica''). Apple trees are cultivated worldwide and are the most widely grown species in the genus '' Malus''. The tree originated in Central Asia, where its wild ancest ...
targeted the Nexus One in a patent lawsuit against HTC, which was settled in December 2012. The Nexus One' reportedly had problems with 3G connectivity and touchscreen at launch. Updates were issued for the operating system, including the addition of multi-touch abilities in the Android web browser and Google Maps functions. While the updates reportedly also somewhat improved 3G connectivity for the T-Mobile USA version of the device, similar issues with the AT&T compatible version have not yet been addressed. A class action lawsuit is pending against Google on the matter, as the phone has problems connecting to 3G networks in areas with less than ideal coverage.


Features


Hardware

At time of launch, the Nexus One had a 3.7 inch
AMOLED AMOLED (active-matrix organic light-emitting diode, ) is a type of OLED display device technology. OLED describes a specific type of thin-film-display technology in which organic compounds form the electroluminescent material, and active matrix ...
screen with
PenTile PenTile matrix is a family of patented subpixel matrix schemes used in electronic device displays. PenTile is a trademark of Samsung. PenTile matrices are used in AMOLED and LCD displays. These subpixel layouts are specifically designed to opera ...
matrix pixel arrangement. The raster resolution is 480×800 pixels, however each pixel in the PenTile RGBG display is represented by only two subpixels on average, using
subpixel rendering Subpixel rendering is a way to increase the apparent resolution of a computer's liquid crystal display (LCD) or organic light-emitting diode (OLED) display by rendering pixels to take into account the screen type's physical properties. It takes ...
rather than the three found in most displays, meeting the definition of WVGA according to the Video Electronics Standards Association specifications for measuring resolution. Citing supply shortages of AMOLED displays, HTC announced on July 26, 2010 that the Nexus One would begin using Super LCD display technology instead of AMOLED. The Super LCD display was described as having greater power efficiency and color accuracy than the AMOLED display, while sacrificing the lauded color saturation and deep blacks of the original display. As of January 15, 2011 or earlier, all Nexus One's available via Brightstar, Google's worldwide distribution partner for Android development phones, shipped with Super LCD instead of AMOLED.To determine whether a phone has the AMOLED or SLCD display, power on while holding the volume down key or pressing the trackball and examine the MICROP line; 0b15 indicates AMOLED while 0c15 indicates SLCD. The internal sticker on the back side of the screen assembly can also be examined; part number 60H00443-03P indicates SLCD and part number 60H00287-00P indicates AMOLED. Finally, USB debugging or a terminal emulator app can also be used to examine the kernel log to determine which display the phone has. The
capacitive touchscreen A touchscreen or touch screen is the assembly of both an input ('touch panel') and output ('display') device. The touch panel is normally layered on the top of an electronic visual display of an information processing system. The display is ofte ...
which uses the
Synaptics Synaptics is a publicly owned San Jose, California-based developer of human interface (HMI) hardware and software, including touchpads for computer laptops; touch, display driver, and fingerprint biometrics technology for smartphones; and touc ...
ClearPad 2000 sensor supports
multi-touch In computing, multi-touch is technology that enables a surface (a touchpad or touchscreen) to recognize the presence of more than one somatosensory system, point of contact with the surface at the same time. The origins of multitouch began at CER ...
gestures limited to single finger input and 2×1D two finger gestures. It has an illuminated
trackball A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes—like an upside-down ball mouse with an exposed protruding ball. Users roll the ball to position the o ...
which can emit different colors of light based on the type of notification being received. A voice processor developed by
Audience An audience is a group of people who participate in a show or encounter a work of art, literature (in which they are called "readers"), theatre, music (in which they are called "listeners"), video games (in which they are called "players"), or ...
uses a second microphone (on the back) to suppress background noise during phone conversations. A 4-conductor TRRS style 3.5mm stereo headset jack is also provided, adding microphone and pause/resume/next/previous functions to the stereo earphones. The phone features a 5.0-megapixel auto-focus camera with LED flash and digital zoom, GPS receiver, Bluetooth 2.0, and 802.11b/g Wi-Fi abilities. The
Snapdragon ''Antirrhinum'' is a genus of plants commonly known as dragon flowers, snapdragons and dog flower because of the flowers' fancied resemblance to the face of a dragon that opens and closes its mouth when laterally squeezed. They are native to r ...
processor allows for many advanced abilities including
720p 720p (1280×720 px; also called HD ready, standard HD or just HD) is a progressive HDTV signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9, normally known as widescreen HDTV (1.78:1). All major HDTV broadcast ...
video playback. There is built in hardware decoding for H.263,
H.264 Advanced Video Coding (AVC), also referred to as H.264 or MPEG-4 Part 10, is a video compression standard based on block-oriented, motion-compensated coding. It is by far the most commonly used format for the recording, compression, and distr ...
and
MPEG-4 MPEG-4 is a group of international standards for the compression of digital audio and visual data, multimedia systems, and file storage formats. It was originally introduced in late 1998 as a group of audio and video coding formats and related tec ...
video, and can play MP3,
AAC+ High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio defined as an MPEG-4 Audio profile in ISO/IEC 14496–3. It is an extension of Low Complexity AAC (AAC-LC) optimized for l ...
,
Ogg Vorbis Vorbis is a free and open-source software project headed by the Xiph.Org Foundation. The project produces an audio coding format and software reference encoder/decoder (codec) for lossy audio compression. Vorbis is most commonly used in conjun ...
,
WAV Waveform Audio File Format (WAVE, or WAV due to its filename extension; pronounced "wave") is an audio file format standard, developed by IBM and Microsoft, for storing an audio bitstream on PCs. It is the main format used on Microsoft Wind ...
, and
MIDI MIDI (; Musical Instrument Digital Interface) is a technical standard that describes a communications protocol, digital interface, and electrical connectors that connect a wide variety of electronic musical instruments, computers, and re ...
audio, and display
JPEG JPEG ( ) is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and imag ...
,
GIF The Graphics Interchange Format (GIF; or , see pronunciation) is a bitmap image format that was developed by a team at the online services provider CompuServe led by American computer scientist Steve Wilhite and released on 15 June 1987. ...
, PNG, and BMP image formats. It has a
micro USB The initial versions of the USB standard specified connectors that were easy to use and that would have acceptable life spans; revisions of the standard added smaller connectors useful for compact portable devices. Higher-speed development of t ...
port which conforms to the
GSMA The GSM Association (commonly referred to as 'the GSMA' or ''Global System for Mobile Communications'', originally ''Groupe Spécial Mobile'') is an industry organisation that represents the interests of mobile network operators worldwide. More ...
Universal Charging Solution The Open Mobile Terminal Platform (OMTP) was a forum created by mobile network operators to discuss standards with manufacturers of mobile phones and other mobile devices. During its lifetime, the OMTP included manufacturers such as Huawei, LG ...
instead of the common
mini-USB The initial versions of the USB standard specified connectors that were easy to use and that would have acceptable life spans; revisions of the standard added smaller connectors useful for compact portable devices. Higher-speed development of ...
port, or HTC's mini-USB compatible format (
ExtUSB The initial versions of the USB standard specified connectors that were easy to use and that would have acceptable life spans; revisions of the standard added smaller connectors useful for compact portable devices. Higher-speed development of t ...
). The
microSD Secure Digital, officially abbreviated as SD, is a proprietary non-volatile flash memory card format developed by the SD Association (SDA) for use in portable devices. The standard was introduced in August 1999 by joint efforts between SanDis ...
card slot allows expansion up to 32 gigabytes of card storage. Applications can be installed either to the 512 MB internal flash memory, of which 190 MB are available for that purpose, or to the microSD card. Many applications, however, are not optimized for installation on external memory, and high data I/O throughput to the microSD may cause applications running off external memory to freeze.


Network frequencies

As of March 16, 2010, there are two versions of the Nexus One, which differ in the 3G frequencies they support. The GSM frequencies supported by both models are 850 MHz, 900 MHz, 1800 MHz and 1900 MHz. Additionally, the original Nexus One (PB99100) also included
UMTS frequency bands The UMTS frequency bands are radio frequencies used by third generation (3G) wireless Universal Mobile Telecommunications System networks. They were allocated by delegates to the World Administrative Radio Conference (WARC-92) held in Málaga-To ...
1 (2100 MHz), 4 (1700 MHz), and 8 (900 MHz). The second version of the Nexus One (PB99110) supports UMTS frequency bands 1 (2100 MHz), 2 (1900 MHz), and 5 (850 MHz). The UMTS radio supports
High Speed Packet Access High Speed Packet Access (HSPA) is an amalgamation of two mobile protocols—High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)—that extends and improves the performance of existing 3G mobile telecommunic ...
,
HSDPA High Speed Packet Access (HSPA) is an amalgamation of two mobile protocols—High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)—that extends and improves the performance of existing 3G mobile telecommunic ...
at 7.2 Mbit/s, and
HSUPA High Speed Packet Access (HSPA) is an amalgamation of two mobile protocols—High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)—that extends and improves the performance of existing 3G mobile telecommunic ...
at 2 Mbit/s.


Software

The Nexus One was released with
Android 2.1 Android Eclair is a codename of the Android (operating system), Android mobile operating system developed by Google, the fifth operating system for Android and the second major release of Android. Eclair spans the versions 2.0.x and 2.1. Unveiled ...
Eclair. The integrated Media Gallery, developed by
Cooliris Cooliris, Inc. was a US corporation headquartered in San Francisco, California, that developed photo viewing products on mobile, web, and desktop platforms. It was a venture backed by Kleiner Perkins Caufield & Byers, T-Venture, DAG Ventures, The ...
, provides several new features allowing the user to browse, edit, and share photos and videos on the phone. Later, an OTA update of
Android 2.2 Android Froyo is the sixth version of Android and is a codename of the Android mobile operating system developed by Google, spanning versions between 2.2 and 2.2.3. Those versions are no longer supported. It was unveiled on May 20, 2010, duri ...
Froyo was released, which introduced a number of highlights: a new Home screen, support for Adobe Flash 10.1, better Microsoft Exchange support, Wi-Fi tethering, SD-card installable applications, cloud to device messaging for two-way push sync functionality and an overall 2-5x performance improvement. The Android 2.2 update caused the Nexus One to develop a serious Wi-Fi connectivity issue which causes the Wi-Fi to continually lose its connection and fail to reconnect. There are reports that Android 2.2.1 had fixed this issue, although there has been no official word from Google. As of January 28, 2011, Android-based phones have access to more than 210,000 applications through
Google Play Google Play, also known as the Google Play Store and formerly the Android Market, is a digital distribution service operated and developed by Google. It serves as the official app store for certified devices running on the Android (operating sys ...
. The Nexus One OTA update to Gingerbread (2.3.3) started on February 23, 2011. The Nexus One currently runs the Google Android 2.3.6, Gingerbread, operating system. Google has stated it will not update the Nexus One to Android 4.0, Ice Cream Sandwich saying the hardware is “too old”; however, third party ROMs were made.


Platform development and modification

The Nexus One ships with an unlockable
bootloader A bootloader, also spelled as boot loader or called boot manager and bootstrap loader, is a computer program that is responsible for booting a computer. When a computer is turned off, its softwareincluding operating systems, application code, an ...
allowing developers to participate in the Android Open Source Project in addition to developing applications. The Nexus One bootloader can be unlocked and various partitions on the device can be flashed with the
fastboot Fastboot is a protocol and a tool of the same name. It is included with the Android SDK package used primarily to modify the flash filesystem via a USB connection from a host computer. It requires that the device be started in Fastboot mode. ...
utility which is part of the Android Open Source Project. Fastboot runs on Linux, Mac OS, or Windows and accesses the Nexus One through the
USB Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
port. The
bootloader A bootloader, also spelled as boot loader or called boot manager and bootstrap loader, is a computer program that is responsible for booting a computer. When a computer is turned off, its softwareincluding operating systems, application code, an ...
of the Nexus One is accessed by holding volume down while powering up the device. Users are able to gain
root In vascular plants, the roots are the organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often below the sur ...
privileges on the device by first unlocking its bootloader using the
fastboot Fastboot is a protocol and a tool of the same name. It is included with the Android SDK package used primarily to modify the flash filesystem via a USB connection from a host computer. It requires that the device be started in Fastboot mode. ...
command fastboot oem unlock and flashing a package that adds the functionality to the system or by uploading specially crafted data packages via the adb program without the need to unlock the bootloader. Unlocking the bootloader or rooting the device allows the user to install non-official firmware images. Additionally, obtaining root privileges enables a user to override protected operating system features, and install arbitrary software. If the fastboot command is used to unlock the bootloader, the user is presented with a Google-created screen stating that unlocking the bootloader will void the warranty as well as void any insurance plan, which the user is required to accept. A NASA project,
PhoneSat PhoneSat is an ongoing NASA project of building nanosatellites using unmodified consumer-grade off-the-shelf smartphones and Arduino platform and launching them into Low Earth Orbit. This project is part of NASA's Small Spacecraft Technology Prog ...
, which builds nanosatellites using unmodified consumer-grade off-the-shelf smartphones, used a Nexus One smartphone running Android 2.3.3 as the onboard computer in their PhoneSat 1.0 version.


Comparison with other phones

Though the
multi-touch In computing, multi-touch is technology that enables a surface (a touchpad or touchscreen) to recognize the presence of more than one somatosensory system, point of contact with the surface at the same time. The origins of multitouch began at CER ...
experience of the Nexus One is generally similar to that of other multi-touch enabled smartphones (e.g., iPhone, Palm Pre, etc), the Nexus One hardware uses software to "enable" multi-touch ability, resulting in x/y axis confusion and preventing some multi-touch applications (e.g., games) from working as they should, compared to other phones. As of an update released February 2, 2010 it has pinch-to-zoom functionality in the phone's Browser, Gallery and Maps applications. In addition to these official applications, 3rd party apps that support multi-touch gestures are available.


HTC Desire

HTC later released the HTC Desire, which has very similar specifications to the Nexus One. The Desire features an optical trackpad rather than a trackball, physical buttons rather than the touch sensitive buttons and an FM radio but lacks the noise cancelling dual microphones present in the Nexus One. The Desire is solely branded as HTC and runs
HTC Sense HTC Sense is a software suite developed by HTC, used primarily on the company's Android-based devices. Serving as a successor to HTC's TouchFLO 3D software for Windows Mobile, Sense modifies many aspects of the Android user experience, incor ...
rather than the stock version of Android. Sense can be switched off to get the stock Android experience however this was disabled on the retail HTC Desire.


Reception

It was praised for its display, processor, and design. However, commentators believed that the phone didn't have enough unique features to gain an advantage against competitors.
David Pogue David Welch Pogue (born March 9, 1963) is an American technology and science writer and TV presenter. He is an Emmy-winning correspondent for ''CBS News Sunday Morning'' and author of the "Crowdwise" column in ''The New York Times'' Smarter Livi ...
of ''
The New York Times ''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid ...
'' praised the Nexus One for its "gleaming, attractive features; it’s hard to choose which is more gratifying: the speed — instant, smooth response when you’re opening programs and scrolling – or the huge, 3.7-inch touch screen, which has much finer resolution than the iPhone," however criticized its dictation, multitouch screen gestures, and animated wallpapers.
Joshua Topolsky Joshua Ryan Topolsky (born October 19, 1977) is an American technology journalist. He is also a record producer, and DJ under the stage name Joshua Ryan. Topolsky was the co-founder and editor-in-chief of technology news network ''The Verge'' ...
of
Engadget ''Engadget'' ( ) is a multilingual technology blog network with daily coverage of gadgets and consumer electronics. ''Engadget'' manages ten blogs four of which are written in English and six have international versions with independent editori ...
believed that although the Nexus One was a good smartphone, it is "at its core just another Android smartphone. It's a particularly good one, don't get us wrong – certainly up there with the best of its breed -- but it's not in any way the Earth-shattering, paradigm-skewing device the media and community cheerleaders have built it up to be. It's a good Android phone, but not the last word – in fact, if we had to choose between this phone or the Droid right now, we would lean towards the latter". Kent German of
CNET ''CNET'' (short for "Computer Network") is an American media website that publishes reviews, news, articles, blogs, podcasts, and videos on technology and consumer electronics globally. ''CNET'' originally produced content for radio and televi ...
praised the Nexus One's display, processor, and voice functions, however criticized the media player and the requirement to store applications on the phone's internal storage.
Goldman Sachs Goldman Sachs () is an American multinational investment bank and financial services company. Founded in 1869, Goldman Sachs is headquartered at 200 West Street in Lower Manhattan, with regional headquarters in London, Warsaw, Bangalore, H ...
slashed their estimates for sales of the phone in 2010 by 70% due to the half-hearted marketing efforts by carriers.


Support

Initially, Google did not provide telephone support and consumers were forced to use its online Android forum. At this time , Google has stopped all support for the phone and customers are directed to contact HTC. On July 16, 2010, Google announced that the next shipment of Nexus One smartphones would be the last to be sold on their web store, stating "While the global adoption of the Android platform has exceeded our expectations, the web store has not. It’s remained a niche channel for early adopters, but it’s clear that many customers like a hands-on experience before buying a phone." The device continued to be sold through retail stores, and other channel partners as of 2010. As of November 1, 2010 Google have closed the Nexus One support forums, redirecting users to the Google Mobile forum, which only has categories for software. The message shown to users was: "The Nexus One forum will be archived and become read-only on November 1st. Please see the Nexus One Terms of Sale for details regarding support. If you have questions about using applications on your Nexus One post them to the Google Mobile Forum." As of the 2011 announcement of Android 4.0, Ice Cream Sandwich, HTC has announced that there will be no more software updates for the Nexus One, as the hardware is now too old to run the new version of Android effectively.


See also

*
HTC Desire The HTC Desire (codenamed Bravo) is the first smartphone of the Desire series developed by HTC. It was announced on 16 February 2010 and released in Europe and Australia in the second quarter of the same year. The HTC Desire was HTC's third fl ...
*
Google Nexus Google Nexus is a discontinued line of consumer electronic devices that run the Android operating system. Google managed the design, development, marketing, and support of these devices, but some development and all manufacturing were carried ...


Notes


References


External links


Official HTC Support

Official Nexus One specifications
{{Authority control Google Nexus Android (operating system) devices Digital audio players HTC mobile phones Mobile phones introduced in 2010 Discontinued flagship smartphones Mobile phones with user-replaceable battery