Originally Posted by Squad10
Do you know what it senses? Or can you point me to a link that describes what you refer to?
The center contact on the radio side of the battery is the radio's 'sense' contact. The radio can sense an impress battery and give a status.
The contacts on the back of the radio battery that the charger connects to. These contacts provide sensing for most battery charger control of the charging cycle. The impress battery has a data communications on one of the pins so the impress charger knows what the condition of the battery is.. I am NOT impressed..