A successful swap can restore the phone's ability to hold a charge for basic tasks like music or nostalgia, sometimes lasting up to 2 days on standby. How To: Replace the iPhone 4's Battery in 2 Minutes
National or local battery specialty stores often carry "compatible" versions for older models. ⚠️ Critical Purchase Considerations buy iphone 4 battery locally
"New" batteries for this model are often old stock that may have degraded even while unused. A successful swap can restore the phone's ability
If you plan to install it yourself, you will need specific tools often sold in "Fix Kits": buy iphone 4 battery locally
To safely pry the battery connector and the battery itself. Estimated Costs & Success Part Only: Typically ranges from $11.99 to $16.99 .