Li-ion alternative for a 3-triple-A pack

[jme]

Hi, I have a host I'm planning to use but it uses a 3 triple A battery pack.
An 18650 is longer than this pack and smaller in diameter. What's a good Li-ion to replace this triple A pack with so I can get more power..

thanks

 

[Laser Smith]

The dimensions of the battery pack would be a big help.. Is your 18650 protected?

 

[sinner]

There are some C-size Li-Ion 22500 or 25500 Li-Ion.. Would hve to remove extra spring length though they are 6mm longer

 

[billg519]

I have a three AAA holder for a flashlight right here. Mine is 21mm dia. by 51mm long. A 25500 may be too fat for your host, my 3 x AAA fits a host with a 23.5mm dia. battery tube. An 18350 with a long battery spring or some magnets might do. An 18650 is too long, at least for the host that my 3 x AAA holder fits. Measure your host carefully.

 

[Extremeshade]

18500 battery length is exactly what you need. I took the 3aaa holder out of my guidesman and this 18500 length is a perfect match

 

[TheDukeAnumber1]

If running a high voltage works for your driver you can just use 3 - 10440's in the AAA pack and not worry about spacers or anything.

 

[billg519]

Could also use 1 x 10440 in the three pack, and two bridge wires in the empty spots. That's if a 10440 will deliver enough current for your application. The 18500 suggested above sounds really good.

 

[justinjja]

Depends on your voltage and current needs;

One of these 18500's will work well for driving a 445nm with a high current boost driver.

Or you could use 3 10440's in the stock battery holder, with a buck driver.

 

[TheDukeAnumber1]

Could also use 1 x 10440 in the three pack, and two bridge wires in the empty spots. That's if a 10440 will deliver enough current for your application. The 18500 suggested above sounds really good.

Building off of that idea, and hoping that jme is still watching this thread. Rewire the stock 3-pack so that it puts three 10440's in parallel. That'll get you the 4.2-2.5 volts you want, decent capacity, and you still get to use the stock parts.