Fairphone 4 Battery Key Features New Battery for Fairphone 4 Keeps 90% Battery Health up to 547 Charges Fast Charge Compatible Allows you to Swap on the Go Working with Fair and Responsible Materials Overview The original Fairphone 4 battery has a lot going for it. It reliably keeps your phone up and running all day long. It comes with convenient fast charging technology that jumpstarts you back to 50% of its 3905mAh capacity in half an hour (when using chargers with a 20W minimum). And it’s probably the world’s easiest and fastest spare part replacement. When the time comes to replace your battery, you don’t have to be an expert to swap it out in only a few seconds. The battery will keep 90% of its original capacity after being charged 547 times (full cycles).