6x aaa flashlight is it possible to change over to ion recharable batteries

i tried to post a pic of the holder the 6 aaa batteries are in to see what batteries i could use

Hello richwyld and welcome to CPF.

One would need to be able to see the electrical pathways of the holder in order to offer a guess about possible options.

It would help if you can take a voltage reading at the final contacts points where the holder transfers power to the flashlight. Typically it would be 4.5V +/- or 6V using alkalines. Any details about the flashlight itself would also help.

If the voltage is 4.5V. it might run off of straight lithium ion rechargeable replacement. If it's 6V. that would be slightly more complicated as 1-cell might not be enough and 2-cells in series might be too much voltage. There are also a variety of rechargeable options in-between.

6xaaa should be 9volts no load and two lithiums max out at 8.4 volts no load. The voltages are within reason but the aaa's are about 44mm long which does not match up well with most lithiums. Try to measure the interior depth of the flashlight body. If it is close to 100mm it may be possible to fit 2x18500's in there. Good luck.

BigusLightus said:

The voltages are within reason but the aaa's are about 44mm long which does not match up well with most lithiums

Click to expand...

I believe 10440 Li-Ion cells are 44mm long.
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2 lithium ions at 8.4v are close-enough to 6 AAA's at 9v. The only issue is internal resistance. The lithium-ions won't voltage-sag under load, like alkalines will. So, those 6 AAA's might really only be delivering 7v under a heavy load. If the flashlight is a piece of junk, and is relying on that battery internal resistance to limit current, then you could fry the light if you try using 2 lithium-ions.

But, at least you won't ruin a good light. Give it a try and find out. Worst case is you get to buy a better light.

Good thinking Batman.
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