The E•P system enables your phone’s built-in charger to communicate with installed batteries and tailor its charging cycle to optimize performance. If you see Invalid Battery when you power up the phone, the built-in charger is not able to communicate with the battery and cannot charge it. There are several possible reasons for this message. The most likely one is that the battery is not a Motorola original and it does not have the appropriate E•P technology. We recommend that you use only Motorola original batteries and accessories and that you store your batteries in their protective clips when not in use.
