Motorola IMPRES Battery NNTN8128C - Li-Ion 1900mAh, Submersible, IP67, for APX SeriesIMPRES 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. Automated maintenance and a six month extended capacity warranty when used with IMPRES chargers. The NNTN8128C is