Flashlight AAA battery cartridge hack: Replace with Li-ion 14500/18500/18560 batteries

Replacing 3-AAA Alkaline battery cartridge with a single Li-ion battery.

[@robertbauer6723]

This is a nice hack. One caution though, is to be careful not to over discharge the Li-ion cell.

[@s1gen]

Inspired by your hack, I decided to investigate more. Just last week on vacaction, I found the 14500 battery in a mobile phone accessories shop in Hong Kong for HKD$10 each (~US$1.28), so I bought 2 to try it out. Oh, I also bought a bag of 50mm stainless screws like you suggested in the previous video. See how it goes

[@keithosterkamp6207]

That was super simple and very useful since I’m trying to standardize on the 3.7v batteries.

[@MrPhotodoc]

Genius as usual. Thanks!

[@wrdptrsn8701]

Thank you! Will be trying this.

[@whitag01]

Awesome information as usual

[@Edmorbus]

beautiful explanation Good work Thanks for sharing

[@edwardfletcher7790]

14500's are awesome ! Some of the lower power flashlights with single AA's can directly take a 14500 as long as you don't run it for so long the LED emitter overheats .

[@JohnClulow]

Brilliant !!

[@hardeeptalreja8134]

The corrosion on the terminals can be removed by cleaning them with a brush dipped with white vinegar.

[@ArtzFenix]

Thank you!

[@cicciodamiani94]

you can use ni-mh batteries they work perfectly fine for light application

[@taoyen1579]

some flashlights have the ability to unscrew the LED (head) part of the flashlight forward a little bit. I've done this to allow room for the larger battery.

[@spud4242]

dang it , i just bought 4 of the 18500 batteries on ebay and for this very purpose.

[@JayLee-it9sc]

wouldn't you run the risk of over discharge without adding a lvc ?

[@riskmandel1]

do you have a good source for 14500s?

[@hashimsalim2665]

Good try.