The HNN4002A is an IMPRES 1800 mAh NiMH battery and is rated intrinsically safe.
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 designed to maximize talk time and optimize battery cycle life - all automatically.