The bosch gba 36 v 20 ah h b professional is a powerful 36 volt battery with 20ah and coolpack technology it boasts a minimum 50 longer run time cf 13 ah battery and the coolpack technology means that it could have a 100 longer lifetime than a battery without the coolpack technology the bosch flexible power system means that it is suitable for all tools in one voltage class and it is extremely robust even surviving a 3m drop onto concrete