ACDelco AB2045L-2 Li-Ion 18-volt  3.0Ah Battery Pack 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 Suitable for ACDelco 18V tools, such as ARI2044B, ARI2060, ARI2061B, ARI2064B, ARL2025, ARG2011