Hitachi BSL1815X 18-Volt Lithium Ion Battery #330139 2 Pack Two Hitachi 330139 18-Volt 1.5-Amp Hour Lithium-Ion Battery BSL1815X These batteries are 18-Volt Lithium Ion at 1.5-Amp Hour Has three times longer battery life and half the weight of Nickle Cadmium or Nickle Metal Hydride Maintains a steady level of power throughout charge Authorized Hitachi Dealers provide the full Hitachi Warranty