Board Thread:Questions and Answers/@comment-24.155.118.8-20130409211342/@comment-6294495-20130410143600

Put your Lappack in your chest armor slot to keep your tool charged. If a tool is already out of power before you put on the Lappack, well some tools will recharge if they are depleted, like the drill, break something with it and the pack will charge it. But, if the wrench is depleted it won't work until it has charge.