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. Automated maintenance and a six month extended capacity warranty when used with IMPRES chargers. The PMNN4407 is a 1650mAh submersible IMPRES battery.