Has anyone here had luck modding a P7 light to use an external battery pack? I'm pretty comfortable with DIY electronics so I think I may try it. I'm thinking of using a battery pack (well 6 or so batteries taped together and wired in parallel) to power 2 P7 lights. Now, if I keep these batteries always together, there shouldn't be a problem with the voltages being different and inducing them to charge other batteries in the pack but has anyone tried to charge a bundle like this with a normal charger?

As for actually connecting the battery, what is standard procedure here? I was going to cut out a cylinder on a lathe (non-metal) and put some metal contacts on the end and then probably just drill a small hole in the barrel of the light to run wires from that metal contacts out to a quick disconnect harness.