Highlights

• Upgraded camera system with a 50MP Sony LYT-808 main sensor.
• Enhanced display with 4500 nits brightness and Aqua Touch feature.
• Powerful Snapdragon 3 chip with up to 16GB of RAM.
• Robust 5400mAh battery with fast and wireless charging capabilities.

Building on last year’s lessons, OnePlus has made significant strides with its newly announced OnePlus 12.

From my experience testing the phone, it seems that they’ve not only updated the internals to the latest specifications but also heavily invested in enhancing the camera system.

This commitment to improvement is evident in the OnePlus 12’s performance across various functionalities.

As a daily driver, the OnePlus 12 has been put through its paces in my hands.

I’ve extensively tested its photographic capabilities, indulged in rigorous gaming sessions, and explored the limits of its display.

My verdict?

The OnePlus 12 confidently stands its ground against the top contenders in the Android world.

It’s a phone that not only meets expectations for a flagship device but in many aspects, surpasses them.

Let’s understand how in my detailed OnePlus 12 review.

OnePlus 12: Key Specs

• Platform: Qualcomm Snapdragon 8 Gen 3 SoC
• Memory: 24GB LPDDR5X RAM 
• Storage:1TB UFS 4.0 ROM
• Display:6.8-inch 120Hz 2K Super Fluid AMOLED display
• Battery: 5400 mAh dual-cell battery
• Charging: 100W SUPERVOOC fast wired charging
• Cameras: 50MP main camera, 64MP telephoto, 48MP ultra-wide
• Dimensions:164.3×75.8×9.15mm
• Weight: 220g

OnePlus 12: Design

The OnePlus 12, in terms of design, stays true to its roots, echoing the familiar aesthetics of its predecessor, the OnePlus 11.

It retains the distinctive circular camera unit embedded in a gracefully curving glass back, surrounded by a sleek aluminium frame.

However, OnePlus introduces a subtle yet noticeable twist with the OnePlus 12.

My review unit, in classic black, features a matte glass back adorned with a sandstone-like gradient that I find particularly appealing.

I feel that this design choice not only adds visual intrigue but also imparts a more premium, less slippery feel compared to the glossy finish of the OnePlus 11.

The camera setup on the OnePlus 12 is where OnePlus has really amped up the drama.

Borrowing the circular module from the OnePlus 11, the 12’s version is not just larger; it demands attention, resembling the dial of a high-end wristwatch.

This striking arrangement is topped with an elegant plate, sheltering the four camera sensors underneath.

A subtle touch of glamour can also be seen with the sprinkling of glitter around the Hasselblad branding, adding to the device’s luxe aesthetic.

In terms of its overall form factor, the OnePlus 12 boasts curves that are both aesthetically pleasing and ergonomic, seamlessly integrating with the front and back of the phone.

While I don’t necessarily think the OnePlus 12’s design is a step back, I did ponder over the idea of distinctiveness in a personal device.

In a market where a smartphone is more than just a gadget – a companion for at least a couple of years – the desire for something visibly new and different is understandable.

Lastly, I do feel that the OnePlus 12 is a bit heavy in my hand at 220g, but given the hardware it packs, this weight is understandable.

OnePlus 12: Display

With a 6.78-inch LTPO display, enhanced with ProXDR and Dolby Vision support, the OnePlus 12 distinguishes itself as one of the brightest displays on the market with an impressive 4500 nits peak brightness.

In my experience, this feature proved invaluable, especially during the bright days of Delhi’s winter.

Whether I was reading news articles or browsing content, the screen’s legibility remained uncompromised, even under direct sunlight.

OnePlus also continues to favour curved screens over the prevalent flat-screen trend in flagship phones, and the OnePlus 12 is no exception.

Its display curves subtly, adding to the aesthetic appeal without compromising usability.

I feel that a novel addition is the ‘Aqua Touch’ feature, designed to enhance touchscreen responsiveness under wet conditions.

In my tests, whether unlocking the phone with a wet screen or navigating apps and social media, the phone responded flawlessly, unaffected by the moisture.

Of course, when it comes to visual performance, the OnePlus 12 doesn’t disappoint.

The display delivers sharp, vibrant images, making it a great device for watching videos on the move.

Complementing the visual experience is the phone’s audio capability.

Equipped with dual stereo speakers supporting Dolby Atmos, the OnePlus 12 produces loud, clear sound.

OnePlus 12: Cameras

In my time with the OnePlus 12, I found that while it continues OnePlus’ tradition of excellent processor performance, its camera capabilities have notably improved.

The device is equipped with a trio of rear cameras: a 1-inch 50MP Sony LYT-808 main camera with a wide f1.6 aperture and larger sensor, a 48MP ultrawide, and a 32MP telephoto lens offering up to 3x optical zoom.

During Delhi’s foggy and smog-filled winter, a challenging environment for any optical apparatus, the main camera of the OnePlus 12 stood out.

It captured colours with remarkable accuracy and vibrancy.

In conditions where dull, polluted air usually hampers photo quality, the OnePlus 12 managed to pull out colours quite impressively.

The zoom functionality maintains clarity up to 6X, but I found the optimal performance at 3X zoom.

There’s also a colour sensor.

The OnePlus 12 benefits significantly from the company’s fourth-generation collaboration with Hasselblad.

This partnership is evident in the colour reproduction of the photos, a feature I observed in last year’s OnePlus Open as well.

The images showcase high saturation levels along with a shallow depth of field that really pops, especially notable under the challenging lighting conditions I experienced – predominantly cold, snowy, and gloomy.

The phone handled these situations well, preventing overexposure of whites and preserving detail in various subjects.

Macro shots were particularly impressive, delivering crisp images with excellent colour and detail retention, as can be expected from a 32MP sensor.

OnePlus has taken a more restrained approach to AI in photography compared to brands like Samsung or Google.

While it doesn’t feature tools like Google’s Best Take or Magic Editor, the OnePlus 12’s photo processing strikes a balanced chord between the two giants’ imaging philosophies. However,

The front camera also sees an upgrade, moving from the 16MP sensor in the OnePlus 11 to a new 32MP sensor.

The selfies and portraits I took were pleasing, exhibiting good quality.

It’s worth noting that the final processed image often differs from what appears in the viewfinder but it is a common aspect in modern smartphone photography.

Overall, the OnePlus 12’s camera setup, while not revolutionary, marks a significant step up for OnePlus, particularly in terms of colour accuracy and handling challenging lighting scenarios.

OnePlus 12 Camera Day Samples

OnePlus 12 Camera Night Samples

OnePlus 12 Day Video

OnePlus 12 Night Video

OnePlus 12: Performance

Using the OnePlus 12, I immediately noticed its impressive speed and performance, a testament to its hardware and software integration.

At its heart lies the latest Qualcomm Snapdragon 3 chip, paired with either 12GB or 16GB of RAM – my review unit boasted the latter.

Qualcomm’s reputation for delivering powerful chips is well-known, and the OnePlus 12 lives up to these expectations.

But what sets it apart is OnePlus’ “Trinity Engine,” designed to optimise the CPU, RAM, and storage for an enhanced user experience.

Initially, I approached these claims with a healthy dose of skepticism.

However, the OnePlus 12 proved its mettle in real-world use.

Playing action RPG Genshin Impact at maximum settings was a breeze, with the gameplay smoothly gliding at 60 frames per second, free of any lag or stuttering.

This flawless performance extended to other demanding games like the BGMI and the fast-paced Asphalt 9: Legends.

OnePlus has also introduced a new feature in the OnePlus 12, the Dual Cryo-velocity Cooling System.

While it’s not the same groundbreaking technology showcased in the OnePlus 11 Concept at MWC 2023, this cooling system effectively prevents the device from overheating.

During my time with the phone, even under heavy usage, it remained cool to the touch, a feature particularly important for prolonged gaming or intensive tasks.

Beyond gaming, the OnePlus 12 excelled in everyday tasks. Whether it was navigating through the phone’s interface or juggling multiple apps, the experience was consistently fluid.

The combination of a high-end chip and software optimisation has definitely played a significant role here.

I also put the phone through several benchmarks.

Interestingly, even in its balanced performance mode, the default setting, the OnePlus 12 delivered more than adequate performance for everyday tasks.

OnePlus 12: Software

OxygenOS 14, which is based on Android 14 is the UI of choice on the OnePlus 12.

The phone has a few OnePlus and Google apps, but nothing that overwhelms or clutches the notification panel with unwanted alerts.

The software is replete with new animations and a plethora of customisation options.

This flexibility makes the OnePlus 12 an appealing choice for both users who enjoy personalizing every aspect of their phone and those who prefer a straightforward, hassle-free experience.

Navigating the OnePlus 12’s UI, I noticed it feels very much like its predecessors, the OnePlus 11 and the OnePlus Open.

I wasn’t a big fan of OxygenOS initially, but after using the OnePlus Open extensively, the interface has grown on me.

Add to that the amount of OnePlus phones I have used over the years and this familiarity adds to the overall comfort of using the OnePlus 12.

However, the software isn’t without its quirks.

For instance, I missed being able to access an app’s permissions screen directly from the app switcher, a feature commonly available on other Android devices.

Also, the OnePlus 12 gets 5 years of software upgrades as compared to the 7 years on the Pixel 8 and Galaxy S24 series.

Despite this, the range of customisation options and features I do like about OxygenOS outweigh these minor inconveniences.

OnePlus 12: Battery

The OnePlus 12’s battery performance is another area where the phone shines.

It is equipped with a substantial 5400mAh battery, which consistently powered me through a full day’s use, typically leaving about 40 percent battery life by night.

In terms of proper screen-on time, I can say that the device got about 6-7 hours.

OnePlus has always excelled in charging technology, and the OnePlus 12 is no exception.

The device comes with an 80W SUPERVOOC wall adapter and the iconic red USB-A to USB-C cable.

While the phone supports up to 100W fast charging, I noticed that the charging speed is capped at 28W with non-OnePlus chargers.

A notable feature in this year’s model is the reintroduction of wireless charging, absent since the OnePlus 10 Pro.

The OnePlus 12 can charge wirelessly at a remarkable speed of up to 50W using the OnePlus AIRVOOC charger, though this is an additional purchase.

Even with standard wireless chargers, it can charge up to 15W, providing flexibility and convenience.

OnePlus 12: Final Verdict

The OnePlus 12, while maintaining the brand’s legacy of powerful performance, shows incremental advancements rather than revolutionary changes.

It harnesses the power of the Snapdragon 3 chip and up to 16GB of RAM, ensuring smooth operation across various tasks, including demanding gaming.

However, the software update longevity doesn’t quite match up with industry leaders, an area where OnePlus could potentially improve.

The battery life is commendable, with a 5400mAh battery lasting a full day under typical use, supported by fast and wireless charging options.

The return of wireless charging is a notable improvement.

On the other hand, the phone’s design, display, and camera, though improved, follow a familiar trajectory rather than offering something substantially new.

So as a whole, the OnePlus 12 is a reliable choice for those seeking a balance of performance and features, but it may not satisfy those looking for groundbreaking innovation in the flagship segment.

Five Reasons to Buy OnePlus 12

• High-Performance Processor: The Snapdragon 3 chip ensures seamless operation for gaming and multitasking.
• Long Battery Life: A 5400mAh battery supports extensive use throughout the day.
• Enhanced Camera System: Offers improved color accuracy and handles challenging lighting scenarios well.
• User-Friendly Software: OxygenOS 14 provides a smooth, customizable user experience.
• Versatile Charging Options: Supports both fast and wireless charging, offering flexibility and convenience.

Three Reasons Not to Buy OnePlus 12

• Lack of Long-Term Software Support: Falls behind competitors in terms of software update longevity.
• Design Redundancy: Lacks innovation in design, closely resembling its predecessors.
• Charging Limitations with Non-OnePlus Chargers: Fast charging speed is restricted when using third-party chargers.

Top 5 Alternatives to OnePlus 12

• Samsung Galaxy S24

The Samsung Galaxy S24 is known for its long-term software support and innovative design.

It features a vibrant 6.2-inch display, a powerful Snapdragon 8 Gen 3 chipset, and a reliable triple camera setup.

The device also offers a variety of colour options and storage capacities. Its unique design and advanced features make it a popular choice among users.

• Google Pixel 8

The Google Pixel 8 stands out for its excellent software updates and unique AI photography features.

It is powered by Google’s own Tensor G3 chipset and comes with an impressive 50MP main camera.

The device also features a 6.2-inch OLED display and a 4575mAh battery. Its AI-powered camera features and software updates make it a top choice for photography enthusiasts and Android purists.

• Apple iPhone 15

The Apple iPhone 15 is renowned for its seamless ecosystem integration and top-tier performance.

It features a new 48MP main camera, a brighter display, and a longer battery life.

The device also comes with a USB-C port and runs on the A16 Bionic chip6.

Its ecosystem integration and high performance make it a preferred choice for many user.

• iQOO 12

The iQOO 12 provides high-end specs at a competitive price point. It is powered by the MediaTek Dimensity 9300 chipset and features a 6.78-inch LTPO AMOLED screen with a 144Hz refresh rate.

The device also boasts a versatile quad-camera system and a large 5000mAh battery. Its high-end specs and competitive pricing make it an attractive option for users seeking flagship features at a lower cost.

• Vivo X100

The Vivo X100 offers a balance of design innovation and performance. It features a 6.78-inch LTPO AMOLED screen, a MediaTek Dimensity 9300 processor, and a versatile quad-camera system.

The device also packs a 5000mAh battery and supports 120W fast charging. Its balance of innovative design and solid performance make it a compelling choice for many users.

Oneplus 12 Flowy Emerald

Oneplus 12 Silky Black

FAQs

What are the major upgrades in the OnePlus 12’s camera system?

The OnePlus 12 features an improved camera setup, including a 50MP Sony LYT-808 main camera, a 48MP ultrawide, and a 32MP telephoto lens, offering superior color accuracy and detail in various lighting conditions.

How does the display of the OnePlus 12 stand out?

The 6.78-inch LTPO display of the OnePlus 12, supporting ProXDR and Dolby Vision, offers a peak brightness of 4500 nits, ensuring clear visibility even in bright sunlight.

What makes the OnePlus 12 a powerful device?

Powered by the Snapdragon 3 chip and available with up to 16GB of RAM, the OnePlus 12 delivers exceptional performance, particularly noticeable in gaming and multitasking.

What are the battery specifications of the OnePlus 12?

The OnePlus 12 is equipped with a 5400mAh battery, supporting 80W SUPERVOOC and up to 50W AIRVOOC wireless charging, providing long-lasting usage and fast charging options.

How user-friendly is the OnePlus 12’s interface?

Running on OxygenOS 14 based on Android 14, the OnePlus 12 offers a customizable and intuitive interface, with a balance of new animations and user-friendly features.

Smooth Beyond Belief: OnePlus Debuts the OnePlus 12. Details?

OnePlus officially launched its latest flagship smartphone, the OnePlus 12, at Pragati Maidan in New Delhi.

Representing the culmination of OnePlus’ decade-long pursuit for excellence and innovation, the OnePlus 12 boasts the Snapdragon® 8 Gen 3 Mobile Platform, the proprietary Trinity Engine, the 4th Gen Hasselblad Camera for Mobile, a new 2K 120Hz ProXDR display, 100W SUPERVOOC fast charging, 50W AIRVOOC wireless charging, and OnePlus’ iconic modern elegant design, delivering an unparalleled flagship experience that is incredibly fast and smooth.

“As we celebrate the tenth anniversary of OnePlus with our loyal users worldwide, we are thrilled to introduce the OnePlus 12 — an all-round flagship phone that embodies our decade-long leadership in technology,” said Pete Lau, Founder of OnePlus.

“With our ‘Never Settle’ mantra, OnePlus is dedicated to bringing innovative ideas to life and disrupting the mobile industry.

With the OnePlus 12, we have created a true masterpiece, combining advanced technologies from OnePlus and our partners to make it one of the best flagship smartphones in the year 2024.”

How does OnePlus 12 give Long-lasting Fast and Smooth Experiences ?

The OnePlus 12 is designed to deliver an uncompromising performance.

At the heart of the OnePlus 12 is Qualcomm’s latest Snapdragon® 8 Gen 3 mobile platform, an ultra-intelligent chip promising top-tier performance and power efficiency with up to 30% improved CPU performance and a 25% enhancement in GPU performance.

Empowered by the proprietary Trinity Engine and equipped with up to 16GB of LPDDR5X RAM and 512GB of UFS 4.0 ROM, the OnePlus 12 can keep applications readily available in the background for 72 hours1.

In addition, OnePlus 12 is the first Snapdragon 8 Gen 3 device to be approved as Snapdragon Spaces™ Ready.

This will allow developers to bring their XR ideas to life and explore the full potential of head-worn AR.

The OnePlus 12 introduces an industry-leading Dual Cryo-velocity VC Cooling System, featuring a 3D capillary dissipation structure and a dual VC design with OnePlus’ largest-ever surface area covering 9,140 mm², revolutionizing the flow of the coolant to significantly reduce overheating.

Crafted using a unibody die-casting manufacturing process, the larger VC consistently absorbs heat from the smaller VC to accelerate the entire heat dissipation process, making the OnePlus 12 a versatile companion for activities such as marathon gaming sessions, pro-level video editing, and concurrent charging without risk of overheating.

With support for 100W SUPERVOOC Endurance Edition and a 5400mAh big battery, the OnePlus 12 reduces the time spent tethered to an outlet, allowing users to use the device more freely.

The OnePlus 12 takes only 26 minutes from 1% to 100% battery capacity courtesy of its 100W SUPERVOOC fast-charging function.

In North America, the OnePlus 12 charges with 80W SUPERVOOC Endurance Edition that can take only 30 minutes from 1% to 100% battery capacity.

The long-awaited 50W AIRVOOC wireless charging also makes its debut in the OnePlus 12, providing a reliable alternative for those who prefer a cable-free lifestyle.

Harnessing the power of a twin-battery design with each cell charging at an impressive 25W, the 50W AIRVOOC outpaces even some of the most advanced wired charging solutions while offering unmatched efficiency.

As a result, the OnePlus 12 has proven its capability to run Genshin Impact at maximum settings, achieving an impressive and consistent frame rate of 57.4FPS3 (Frames Per Second) during a rigorous 3-hour testing session.

Furthermore, its exceptional battery performance enables it to sustain 5.5 hours of continuous video shooting at 1080p resolution, operating at 30Hz.

In addition, the all-round flagship experience on the OnePlus 12 is boosted further by powerful and stable wireless signal performance.

The omnidirectional antenna design, with a total of 16 antennas, enables the OnePlus 12 to unleash the full potential of high-speed connectivity.

OnePlus 12 features Authentic Hasselblad Style Photography. Details?

The OnePlus 12 stands out as a photography master with a professional-grade camera system featuring flagship hardware and advanced image processing algorithms developed in collaboration with Hasselblad.

The phone takes the flagship-level triple camera system of the OnePlus 11 and brings it to the next level with an industry-first 50MP Sony’s LYT-808 wide-angle camera.

Featuring a large ƒ/1.6 aperture and 1/1.4-inch sensor size, the camera offers a greater depth of field while compensating for the loss of light to deliver crystal-clear images with vibrant colors and intricate details even in low-light environments.

Red glare and artefact reduction are also supported to help capture even more true-to-life images.

As the first OnePlus single-screen flagship to feature a best-in-class OV64B 3x periscope telephoto camera with 6x in-sensor zoom, the OnePlus 12 offers a 3x to 120x photographic zoom range that gives users the flexibility to capture spontaneous moments and highly expressive portraits from afar.

This unrivalled periscope telephoto lens not only ensures high image quality but also perfectly replicates natural lights and shadows.

With its 114° field of view in an impressive 48MP resolution, the OnePlus 12’s ultra-wide camera is more than just the icing on the cake, instead empowering users to capture a broader perspective on life that still retains the finest details.

OnePlus’ latest RAW HDR algorithm further enhances the phone’s ability to control light by understanding visual landscapes and harmonizing the interplay between highlights and shadows.

By rendering optimal brightness, balanced exposure, authentic color saturation, and seamless vignette control, the OnePlus 12 makes it possible to capture DSLR-like images that mirror reality with impeccable resolution and even greater precision.

The newly upgraded Hasselblad Portrait Mode simulates the nuances of bokeh and flare effects of Hasselblad’s classic lenses from 1x to 3x, adding additional visual angles while imparting a natural depth of field to create transitions between subject and background that are seamless beyond belief.

Does OnePlus 12 have a Modern Elegant Design?

The OnePlus 12 is a masterpiece in design that pays tribute to a decade of OnePlus’s daring spiring and bold attitude.

Drawing inspiration from the intricate craftsmanship of luxury watches, the phone inherits the timeless modern elegance of the OnePlus 11 5G while adopting a hollow-curved design that mirrors the precision found in the delicate inner workings of a finely polished timepiece.

The OnePlus 12 is available in two colorways — Flowy Emerald and Silky Black. Inspired by the breathtaking spectacle of the braided Dart River in New Zealand, where emerald ribbons pulsate with vibrant energy, Flowy Emerald captures the essence of natural wonders and employs state-of-the-art AG technology and a precision etching process to bring a premium texture with exquisite dynamism to the phone’s glass back cover.

What’s the Price & Availability of OnePlus 12?

The OnePlus 12 will be launched in two exciting variants, the 12/256GB option which will be priced at INR 64,999 and the 16/512GB option which will be priced at INR 69,999 will go on sale at 12:00 PM on 30th January.

The pre-booking for the OnePlus 12 starts from 8:45 PM on 23rd January. Customers can get a free trial of Google One & YouTube Premium on OnePlus 12. Find more details on OnePlus.in.

Customers can avail an instant bank discount of INR 2,000 with ICICI credit card and OneCard.

Customers can avail a special exchange bonus of up to INR 10,000 while purchasing the OnePlus 12.

Customers can also buy the OnePlus 12 with OnePlus Easy Upgrades and get 35% assured value at the end of the 24 months.

A special pre-booking offer is available for INR 1,999, where customers can pre-order the OnePlus 12 from 23rd January and also avail no cost EMI for 12 months.

The first 1,000 customers who order the OnePlus 12 are entitled to exclusive OnePlus Merchandise.

OnePlus 12 and users can link to RCC and avail a special coupon discount of INR 3,000 discount while purchasing the OnePlus Pad.

Customers can also avail of 50% off on the Accidental Damage Protection Plan, available on OnePlus.in, OnePlus Store App and OnePlus Experience Stores.

How does OnePlus 12 give Cinematic Visual and Audio Experiences?

The OnePlus 12 harmonizes an ultra-bright display with cinema-like sound to bring users flagship audiovisual experiences like never before.

At the centre of this experience is a 2K 120Hz ProXDR display powered by BOE’s brand-new blue diamond pixel layout, which enables the OnePlus 12 to reach a peak brightness of 4,500 nits – the brightest-ever screen on a OnePlus smartphone – with the ability to deliver ultra-realistic, silky-smooth visuals for a premium viewing experience.

ProXDR further ensures that lossless images with high dynamic range and a rich color spectrum can be enjoyed in full detail on the phone’s stunning display.

This innovative display sets or matches 18 smartphone display performance records of DisplayMateA+. It also receives Intelligent Eye Care certification by TÜV Rheinland thanks to its ability to effectively reduce blue light emission and intelligent color temperature adjustment in response to changing ambient conditions.

Fitted with LTPO technology, the display can automatically switch between a refresh rate of 1Hz to 120Hz based on user preferences and specific usage scenarios while keeping power consumption comparatively low.

Dolby Vision is also supported to elevate the overall visual experience with ultra-vivid colors, crisp contrast, and intricate details.

For avid gamers seeking hyper-realistic and ultra-immersive mobile gaming experiences, the OnePlus 12 offers the perfect solution in the form of HyperRendering.

Built upon OnePlus’ in-house graphics algorithms and a dedicated Pixelworks X7 Independent Visual Processor, this groundbreaking visual quality enhancement technology empowers the OnePlus 12 to deliver super-resolution picture quality with remarkable efficiency, achieving 120Hz frame rate for all games through frame Interpolation technology2 while ensuring real-time HDR color calibration.

For enhanced touch accuracy, Aqua Touch can detect wet fingers and water droplets on the screen and compensate accordingly, significantly alleviating issues related to sweaty hands and mistouches during both intense gameplay and everyday use.

Complementing the high-quality visuals are immersive 3D sound spaces that add the finishing touch to the all-round entertainment experience.

When paired with the OnePlus Buds 3 or other OnePlus earbuds with spatial audio and in-app customization support, the OnePlus 12 delivers simultaneous playback of different audio content in multiple directions to create a flagship 3D Spatial Audio experience.

Thanks to the inclusion of dual stereo speakers with Dolby Atoms, dedicated spatial audio can even be enjoyed without earbuds, offering cinema-level audio quality with reduced acoustic resonance.

ONEPLUS 12 KEY SPECIFICATION

Key Specs

General

Performance

Display

Camera

Battery