Motorola NNTN7554B Battery Impres Standard IP67 Liion2050M2100T (Black) IMPRES batteries when used with an IMPRES charger provide automatic, adaptive reconditioning, end-of-life display, and other advanced features. Data is stored in the battery and communicated to the charger via a unique IMPRES communication protocol which is designed to maximize talk-time and optimize battery cycle life -all automatically. Compatible: Motorola PR1500, Motorola MT1500