Here's how to check if your iPhone needs a new battery
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Apple iPhone 3GS 16GB Back cover housing +Small Parts + battery + repair tools | eBay
Third-Generation iPhone SE Teardown Reveals Larger Battery Capacity and Snapdragon X57 Modem - MacRumors
Use Low Power Mode to save battery life on your iPhone or iPad - Apple Support
AirBox Go| The 3-in-1 MagSafe Battery Pack for Apple Devices by MOMAX Airbox — Kickstarter
Original Antirr Replacement Battery For Apple Iphone 3gs 8gb 16gb 32gb 616-0431 616-0433 616-0435 616-0436 Mc137ll 3790233 - Digital Batteries - AliExpress
NewerTech® : Batteries : NuPower® Battery Replacement Service for Apple® iPhone® 3GS
Amazon.com: 3 in 1 Battery Pack for Apple Watch iPhone, (3000mAh) Magnetic Wireless Portable Charger for Mag-Safe iPhone 14 Pro Max/13/12, All 8 iWatch Series, Travel Essentials Backup Charger : Cell Phones & Accessories