How to Triple the Battery Life of AAA Flashlights

When using 3 watt LED flashlights powered by AAA batteries, they last for about 30 minutes. There is a way to triple the run time by using AA batteries. In this Instructable, I will show you how to hook up a AA battery holder to a flashlight.

Step 1: Things Needed

Drill
Heat shrink tubing
Inexpensive flashlight to modify (eg. Techlite Lumen Master)
3AA battery holder with cover
3 AA NiMH batteries
Wires
Wire cutters
Solder
Sand paper

Comments

[criggie]

Nice idea - execution could be tidier. There are a stack of torch holders on dx.com which would be perfect for holding the torch down better.

Personally I have a couple of old nokia phones and almost a dozen lithium batteries. I plan on gutting a phone and using the battery contacts and retaining clips, then permanently wiring it to LEDs on the bike.

Recharging batteries will use a desktop recharger I have spare.... Instructable to come one of these days.

[hanlin_y]

Thanks for the suggestions. I just ordered a couple of bike mounts. Laptop batteries use 18650s which usually works well.