BM6721L(re) BM6721L 6700mA / 7.2V (46Wh) Double O-ring specification. Double O-ring compatible light modules LM5K2600S2, LM4.2K2200G2, LM5K1300S2, LM4.2K1100G2, LM5K-SP17-2 Included Parts: Battery module cap