This product may no longer be manufactured or available for sale.

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 HNN9031 will be replaced by the NNTN4436.