I made a torch using a super capacitor 100 farad 2.7 volts instead of the battery and a light bulb 1w LED by relative lampholder that he had burned the circuit.
Convenience is the instantaneous charging of the super capacitor in a mimuto about providing you with the maximum power with a battery life of the lamp continuously for a few hours but if you leave it turned on, after 24 hours there's still a link light.
I added a switch to the torch and a female connector for charging DC power supply from 3.3 V 2A.