While there are numerous battery cases for iPhones, the Prong PWR Case for iPhone 6 and iPhone 6s differentiates itself with a built-in, collapsible wall charger. The folding prongs enable you to charge your iPhone by simply plugging it into a wall outlet, making it ideal for work, home, travel, or wherever receptacles are available.

IMG_2774
Better yet, the PWR Case eliminates the need to have a Lightning charging cable wherever you go for cord-free convenience. But, as with all battery cases, there are important variables to consider before making your purchase, ranging from size and weight to battery capacity and price. Find out how the PWR Case stacks up ahead.

Design

The Prong PWR is a two-piece case consisting of a detachable outer battery pack with rear folding prongs, and a slimmer inner case that resembles a typical silicon bumper for iPhones. You place your iPhone in the bumper case, which slides into the sled-shaped, tapered battery pack with a built-in male Lightning connector.

IMG_2807
You could technically fit a naked iPhone, or use another case, but the device would fit loosely inside the battery pack and could fall out.

The battery pack has a smooth polycarbonate finish that easily collects fingerprints and smudges, especially if you have oily or sweaty hands. The outer case has a small lightning logo between the folding prongs, but otherwise it has no outward-facing branding or markings. Inside the case is a debossed Prong logo and a regulatory label.

IMG_2815
Meanwhile, the inner case has thermoplastic edges that should offer average protection against minor drops and scratches, and provide added grip that the iPhone 6s so desperately needs. The rear is covered by clear plastic, except for the area between the top antenna band and upper edge of the smartphone, which is exposed to avoid obstruction of the rear camera and dual-LED flash.

The side power button and volume controls are both covered by plastic that is easy to press, while there are small pass-through cutouts for the Lightning connector, 3.5mm headphone jack, speaker, and bottom microphone. When the outer battery case is attached, these ports are all covered by the thick polycarbonate shell.

IMG_2791
The PWR is undeniably thick and heavy, which was likely an unavoidable design tradeoff in order to integrate folding prongs. As someone who wears skinny jeans, one of my main concerns with battery cases is pocketability, and the PWR has a noticeably tight fit in my front pocket that leaves little to no room for my keys or wallet.

The PWR is also tall, adding about half an inch of height to your device. While the iPhone 6s form factor allows for acceptable one-handed usage, using this case will move you into two-handed usage territory unless you consistently rely on Reachability. If you deliberately avoided a Plus-sized iPhone for this reason, you may find this to be a nuisance.

Prong-side-by-side
The two-piece design, however, helps to mitigate these problems if you are okay with leaving the outer battery pack behind at times.

This half-inch chin contains a wide speaker grille that channels the iPhone 6s audio from the bottom to the front of the smartphone, but the sound quality becomes somewhat muffled and tinnier in the process. There is also a 3.5mm headphone jack opening with an extension adapter included in the box.

Functionality

PWR Case has a built-in 2,600 mAh lithium polymer rechargeable battery pack that delivers on Prong's promise of up to 100% additional battery life. Comparatively, the iPhone 6 and iPhone 6s have 1,810 mAh and 1,715 mAh battery capacities respectively, so the PWR Case provides just over double the milliampere-hours on a full charge.

The folding prongs can charge both the internal iPhone battery and external battery pack simultaneously, or just the battery pack. The case took about two hours to fully charge from 0%. The charging level is indicated by four LED lights on the back of the case that can be seen on both the inside and outside of the shell.

IMG_2817
A square button on the bottom of the PWR Case can be pressed to check the battery pack level and activate iPhone charging from backup battery. Holding the button down for 2-3 seconds will turn off the charging. Prong's FAQ details how to reset or put your PWR Case in Sleep Mode.

The case delivers output of 5V/1A (5 watts), which is equal to Apple's 5W USB Power Adapter and is the maximum charge rate that Apple allows for iPhone charging accessories. Prong also includes a Micro-USB cable in the box as a backup charging method, or to sync your iPhone with iTunes without detaching the outer battery case.

Meanwhile, the case has universal input that works with any 100-240V AC power outlet. However, the folding prongs can only be used with plugs in the United States, Canada, Mexico, China, Japan, and select countries in South America. Elsewhere, a plug adapter is needed. Prong says PWR Case has both UL and FCC safety certification.

Value

PWR Case for iPhone 6 and iPhone 6s is available for $99 with a 2,500 mAh lithium polymer battery through Amazon and Prong's website in four colors: black, clear, blue-black, and red-white. A larger 3,500 mAh capacity model is also listed for $119, but it is listed as out of stock on Prong's website. PWR Case is not available for iPhone 6 Plus or iPhone 6s Plus models at this time.

At least one contributing factor to the PWR Case's higher price is that it is certified under the MFi Program, meaning the accessory has been designed to connect specifically to iPhone and has been certified by the developer to meet Apple performance standards. MFi accessories are often more expensive than uncertified products.

The baseline for comparison should be Anker's Ultra Slim Extended Battery Case, which Wirecutter ranks as the best battery case for iPhone 6/6s. Anker's MFi certified case is just $40, slimmer, and has a larger 2,850 mAh battery capacity, so your decision should primarily be based on whether you think folding prongs are worth 2.5x extra.

Many other MFi-certified iPhone 6 and iPhone 6s battery cases without folding prongs are available in the $50 to $130 range, including models from Incipio, iBattz, Odoyo, PowerSkin, LifeProof, Boostcase, OtterBox, and other accessory makers, so Prong's PWR Case is on the higher end of prices compared to the overall market.

Pros

  • Folding prongs

  • Two-piece design

  • Up to 100% extra battery life

  • 1.0-1.2A quick charging

  • LED charging level indicators

  • MFi certified

  • Sleep Mode

  • Nice book-like magnetic packaging
Cons

  • Big and bulky

  • Higher-end price

  • Makes one-handed usage difficult

  • Speaker sounds muffled

Bottom Line

$60.

That's the price difference between Prong's PWR Case and Anker's Ultra Slim Extended Battery Case for iPhone 6/6s.

If folding prongs are something you are looking for, the PWR Case is your best bet. Otherwise, consider Anker or other brands.

Top Rated Comments

GeneralChang Avatar
121 months ago
I'm... actually far more interested than I thought I'd be, honestly.
Score: 1 Votes (Like | Disagree)
autrefois Avatar
121 months ago
Plus, it's a great way to hang the latest headlines from MacRumors on your wall! :D
Score: 1 Votes (Like | Disagree)

Popular Stories

iPhone 17 Pro Lower Logo Feature 1

iPhone 17 Pro Coming Soon With These 14 New Features

Monday June 30, 2025 1:08 pm PDT by
Apple's next-generation iPhone 17 Pro and iPhone 17 Pro Max are less than three months away, and there are plenty of rumors about the devices. Apple is expected to launch the iPhone 17, iPhone 17 Air, iPhone 17 Pro, and iPhone 17 Pro Max in September this year. Below, we recap key changes rumored for the iPhone 17 Pro models:Aluminum frame: iPhone 17 Pro models are rumored to have an...
Apple Watch Ultra Night Mode Screen

Apple Watch Ultra 3 Launching Later This Year With Two Key Upgrades

Wednesday July 2, 2025 1:13 pm PDT by
The long wait for an Apple Watch Ultra 3 appears to be nearly over, and it is rumored to feature both satellite connectivity and 5G support. Apple Watch Ultra's existing Night Mode In his latest Power On newsletter, Bloomberg's Mark Gurman said that the Apple Watch Ultra 3 is on track to launch this year with "significant" new features, including satellite connectivity, which would let you...
iPhone 17 Pro Lower Logo Magsafe

iPhone 17 Pro's New MagSafe Design Revealed in Leaked Photo

Wednesday July 2, 2025 8:37 am PDT by
The upcoming iPhone 17 Pro and iPhone 17 Pro Max are rumored to have a slightly different MagSafe magnet layout compared to existing iPhone models, and a leaked photo has offered a closer look at the supposed new design. The leaker Majin Bu today shared a photo of alleged MagSafe magnet arrays for third-party iPhone 17 Pro cases. On existing iPhone models with MagSafe, the magnets form a...
A18 Pro Chip

New MacBook With A18 Pro Chip Spotted in Apple Code

Monday June 30, 2025 8:05 am PDT by
Apple is developing a MacBook with the A18 Pro chip, according to findings in backend code uncovered by MacRumors. Earlier today, Apple analyst Ming-Chi Kuo reported that Apple is planning to launch a low-cost MacBook powered by an iPhone chip. The machine is expected to feature a 13-inch display, the A18 Pro chip, and color options that include silver, blue, pink, and yellow. MacRumors...
Wi Fi WiFi General Feature

iOS 26 Adds a Useful New Wi-Fi Feature to Your iPhone

Wednesday July 2, 2025 6:36 am PDT by
iOS 26 and iPadOS 26 add a smaller yet useful Wi-Fi feature to iPhones and iPads. As spotted by Creative Strategies analyst Max Weinbach, sign-in details for captive Wi-Fi networks are now synced across iPhones and iPads running iOS 26 and iPadOS 26. For example, while Weinbach was staying at a Hilton hotel, his iPhone prompted him to fill in Wi-Fi details from his iPad that was already...
macbook air spacegray purple

Apple Planning to Launch Low-Cost MacBook Powered By iPhone Chip

Monday June 30, 2025 3:20 am PDT by
Apple is planning to launch a low-cost MacBook powered by an iPhone chip, according to Apple analyst Ming-Chi Kuo. In an article published on X, Kuo explained that the device will feature a 13-inch display and the A18 Pro chip, making it the first Mac powered by an iPhone chip. The A18 Pro chip debuted in the iPhone 16 Pro last year. To date, all Apple silicon Macs have contained M-series...
iOS 18

Apple Releases Second iOS 18.6 Public Beta

Tuesday July 1, 2025 10:19 am PDT by
Apple today seeded the second betas of upcoming iOS 18.6 and iPadOS 18.6 updates to public beta testers, with the betas coming just a day after Apple provided the betas to developers. Apple has also released a second beta of macOS Sequoia 15.6. Testers who have signed up for beta updates through Apple's beta site can download iOS 18.6 and iPadOS 18.6 from the Settings app on a compatible...
maxresdefault

Five Features Coming to AirPods Pro 3

Friday June 27, 2025 10:52 am PDT by
Apple hasn't updated the AirPods Pro since 2022, and the earbuds are due for a refresh. We're counting on a new model this year, and we've seen several hints of new AirPods tucked away in Apple's code. Rumors suggest that Apple has some exciting new features planned that will make it worthwhile to upgrade to the latest model. Subscribe to the MacRumors YouTube channel for more videos. Heal...
replay all time playlist apple music

Apple Music Debuts All-New Personalized Playlist

Monday June 30, 2025 7:16 am PDT by
As part of its 10-year celebrations of Apple Music, Apple today released an all-new personalized playlist that collates your entire listening history. The playlist, called "Replay All Time," expands on Apple Music's existing Replay features. Previously, users could only see their top songs for each individual calendar year that they've been subscribed to Apple Music, but now, Replay All...