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^$ 16 ⁹⁹

ASDAWN 4000mAh Battery for iPhone 6 (Not for 6s/ 6 Plus/ 6s Plus), Upgraded Higher Capacity iPhone 6 Battery Replacement for A1549 A1586 A1589 A1522 A1524 A1593 with Professional Tools

247

^$ 14 ⁸⁹

XYIRMCYF 13000mAh Super Capacity Battery Compatible with iPhone 6/6G, 0 Cycle Li-Polymer Replacement Battery for iPhone 6/6G, with Repair Tool Kit

880

^$ 19 ⁸⁷

AFSONGOO Battery for iPhone 6 (4.7"),Upgraded Phone 6 Battery Replacement Compatible with iPhone 6 Battery A1549 A1586 A1589 with Professional Repair Tools Kit

^$ 18 ⁹⁹

Svenirven Battery for iPhone 6, 2025 New Upgraded Battery Replacement for iPhone 6 A1549 A1586 A1589 A1522 A1524 A1593 with Professional Repair Tool Kit

^$ 14 ⁸⁹

ERYNK 616-0805 616-0806 Rechargeable Battery Compatible with iPhone 6 Model A1549, A1586, A1589, A1522, A1524, A1593 with Tools

^$ 15 ⁹⁹

TQTHL 11800mAh Upgraded Battery for iPhone 6, 2025 New Version Ultra-High Capacity 0 Cycle Replacement Battery for iPhone 6 A1586,A1589,A1549 with Professional Repair Tool Kits

^$ 18 ⁹⁹

Upgraded Battery for iPhone 6 (4.7"), High Capacity Replacement iPhone 6 Battery A1549 A1586 A1589 with Professional Repair Tools Kit

872

^$ 16 ⁹⁸

ASDAWN 2780mAh Battery for iPhone 6 (Not for 6s/ 6 Plus/ 6s Plus), Upgraded Higher Capacity iPhone 6G Battery Replacement for A1549 A1586 A1589 with Professional Repair Tools+Installation Instruction

Requirements for iPhone 6 battery replacement

apple.stackexchange.com › questions › 311067 › requirements-for-iphone-6-battery-replacement

From the Apple site

https://support.apple.com/en-us/HT201557

Before you bring in your device

Follow these steps before you take your device to an Apple Store, Apple Authorized Service Provider, or carrier. If your device won't turn on or respond, finish as many steps as possible:

Back up your iOS device.
Have your Apple ID password ready. For some repairs, you'll need your Apple ID password to erase your device and turn off Find My iPhone.*
Bring your sales receipt (if possible), in case your service requires proof of purchase.
Bring your device and any accessories that you need help with.
Bring a form of personal identification, like a driver’s license, passport, or other government-issued ID.
If you haven't already, call to check whether you need an appointment before you go to a service location. For example, schedule a Genius Bar reservation before you go to an Apple Store.

Before you send your device

Follow these steps before you send your device in for repair or replacement. If it won't turn on or respond, finish as many steps as possible:

If you need to send in an iPhone that's paired with an Apple Watch, unpair your devices. When you unpair, your iPhone will create a new backup of your Apple Watch. You can use the backup to restore your Apple Watch when your iPhone returns from service.
Back up your iOS device.
Go to Settings > Messages and turn off iMessage.
Erase your device. Go to Settings > General > Reset > Erase All Content and Settings. If asked, enter your passcode and Apple ID password. If you can't erase your device because it won't power on or isn't responding, you can erase it from iCloud.com. Learn how.
Make sure that Activation Lock is disabled.
Remove any SIM card, case, or screen protector from your device and keep your cable and charger. Now your device is ready to send. If you arranged a repair request, you should have received instructions for how to mail in your device. If you didn't get instructions or you haven't set up a repair request, contact Apple Support.

You can find additional answers here: https://support.apple.com/iphone/repair/battery-power

Answer from Jolley71717 on Stack Exchange

Amazon

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Amazon.com: Iphone 6 Battery

Amazon.com: iphone 6 battery

Best Buy

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Apple Iphone 6 Battery - Best Buy

Easy to install too....Great Battery...He’s had his IPhone 6 Plus for years now. And it’s got a lot of memory so might as well fix what we can on it." ... This replacement 3.8 Volt 2900mAh Lithium Ion battery fits the Apple A1522 Cellular Phone and meets or exceeds original manufacturer ...

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