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 â€” all automatically. Automated maintenance and a six month extended capacity warranty when used with IMPRES chargers. The PMNN4077 is a 2200mAh Li-ion submersible battery that provides a high-capacity solution for MOTOTRBO users with intense radio usage. For more information on Motorola IMPRES and Premium Battery Solutions, visit Proven Tough.