Battery for Balr X7 Battery for your Balr X7 New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store Same capacity as original battery Specifically made for the iDroid Balr X7. Tech Spec: Battery Capacity: 3000 mAh Voltage. The iDroid Balr X7 battery is the same battery that comes with your Balr X7 when bought, so it has the same capacity. This means whether you're looking to replace an old battery or simply want a spare, you can be confident of getting the same battery life out of your phone as you originally experienced.