Use the Ic2 Api
http://ic2api.player.to:8080/job/IC2_experimental/397/
battery name
// batteries
reBattery; // Empty RE Battery item, currently not meta sensitive
chargedReBattery; // RE Battery item, meta = damage value for charge level
advBattery; // Adv Batteryitem, meta = damage value for charge level
energyCrystal; // Energy Crystal item, meta = damage value for charge level
lapotronCrystal; // Lapotron Crystal item, meta = damage value for charge level
suBattery; // SU Battery item, meta = damage value for charge level