Features & Benefits: New G12 12V Li-ion battery pack for all your G12 tools; Only 0.45 lbs (0.20 kg) light-weight and compact size design; Thermal protection circuit prevents charging battery cells from damage caused by extreme temperature conditions.; Li-ion battery cells provide excellent performance: higher cell capacity per unit weight, low self-discharge & no memory effect.; Get that extra battery in your tool kit so you are always ready to do the job!