3xAAA battery adapter (for headlamp)
thingiverse
My headlamp eats a lot of juice, so I got tired of buying or charging AAA batteries all the time. With my 10Ah power bank, it shines for an incredibly long time :). Maybe it could be used with other gadgets too. But be careful: three AAA batteries add up to only 4.5 volts, and my power bank gives out 5V, so make sure your device can handle that. You can add a diode or two to drop the voltage. Also check if your power bank can deliver the current my headlamp needs. It requires about 1.5 amps in power mode. Extra supplies: * Two M3 nuts, 10 mm long * An old USB cable * One power bank :) I soldered the wires to the screws. Give the screws a pre-solder before screwing them into the adapter.
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