I have a two cell (18650) P7 flashlight and a one cell P7 flashlight. Both throw great light, though the 2 cell is bulky for a bike light.
I'm currently getting a Sturmey Archer 6v 3watt hub wheel for a new bike. My question is - could a P7 be adapted for use with the dynamo? The 18650 are nominal 3.7v.
Would a dummy battery connected to the hub work? Could the 18650 be wired in parallel - and be kept charged up while moving while providing a stand light?
What's horribly wrong with my reasoning (I suspect the P7 draws too many watts)?