Motorola PMNN4077D IMPRES 2400 mAh Li-Ion submersible battery provides a high-capacity solution for MOTOTRBO radio users in extreme environments and intense conditions. IMPRES Charger Required: WPLN4232A, WPLN4212A, WPLN4219A 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.