The IN1500300 12V NiMH battery charger comes with negative delta V detection, bad cell detection, and equipped with built-in timer, short circuit and reverse polarity protection. This 12 volt battery charger is a compact, accurate, automatic multistage charger works with 10S 12V NiMH rechargeable battery pack. The 12V NiMH charger runs at a soft charging of a 300-mA rate to preserve capacity and will automatically terminate the charge when it detects -dV.