LiIon Cell Sizing 'chart/guide'

If you're looking to replace 3xAAA with lithium ion, you really want to go with 1x cell, in order to roughly match voltage.

From what I can determine, this implies a 22500, which is pretty difficult to find. As has been mentioned by others, I think an 18500 is the runner up.

2x CR2 doubles the voltage, as does 2x 14250. Bridging two of the three AAA slots and going with a single 10440 would significantly impair capacity.

Frankly, I'm really really surprised that we can easily get obscure sizes like 17670, that don't seem to have an obvious use-case, but something like a 22500, which would be a clear size replacement for a 3xAAA holder and also closely approximate the voltage of such, is hard to find.

aah, im not looking to just replace 3x aaa's. im looking to replace it and get 6v of power as i need it to power a ghostdrive and a lpc-826 running at 500mA. so thats the really difficult part, i could get 1 cell that would replace 3aaa's but no single cell (as far as i know) is going to be 6v and fit the gap. so thats why i need 2 small 3.6/7 v batteries that will bridge the gap.
kinda hard to understand what i mean but yeah

17670s were found in a few different laptops, and even some 14500s were found in very small form laptops, although these two are still pretty rare. Don't think you can really get worthwhile 17670s anymore, only china brands.

All the other cells are just weird sizes that might have special one-off uses here and there.

People commenting on confusion of the naming convention of these cells ought to read this thread. You probably haven't seen it yet: http://laserpointerforums.com/f67/liion-cell-sizing-chart-guide-73012.html


Frankly, I'm surprised more people don't just make lipo builds. Is a rectangular build really that bad? It allows for stability, anti-roll, no kids mistaking it for a flashlight, flexibility in space constraints... Is it because circles are better at describing wave functions while rectangles deal more with classical geometry?

At daewood, awhat about 2x18350

i dunno man, anything that fits into the host and gives me 6v is ok for me. as far as i can tell i can replace the whole battery holder with 2 1/2AA or i can get 2 10440 and bridge the remaining gap on the battery holder.

at the moment the 2 1/2AA seem like the wiser decision as they are much cheaper and more readily available than the 10440 batteries. 2 16340 batteries dont fit at all, but anyhting like a 25 would

What host is it?

BShanahan14rulz said:

Frankly, I'm surprised more people don't just make lipo builds. Is a rectangular build really that bad? It allows for stability, anti-roll, no kids mistaking it for a flashlight, flexibility in space constraints... Is it because circles are better at describing wave functions while rectangles deal more with classical geometry?

At daewood, awhat about 2x18350

Click to expand...

I like working with LiPos. I think the issue is more commonly just that we use cylindrical flashlight hosts for a large number of builds. Inserting a square (or rectangular) battery pack into a cylindrical cavity results in quite a bit of wasted space.

For the rare few truly custom (non-flashlight) hosts we see around here, they're likely made on a lathe, not a CNC. Thus, it's probably difficult to create a square cell compartment.

its not really a registered host (like ultrafire etc) but its a really small ( in length) 9led flashlight, or it used to be until i gutted it. it takes 3aaa's and there is a small space in the head where the led's used to be, which is where im planning on putting the ghostdrive and also the heatsink. but i need some batts for it, and there just isnt any extra space, like i cant drill out the tailcap or move all the components forward, because if i do then the heatsink will have nowhere to be glued to, it will just literally be hanging on by a few wires

I've been playing with various Lithium ion sizes in different torches, laptops packs, and laser hosts and the 3xAAA hosts are a pain, the holders are often different sizes too. Wiki has.

Good list of battery sizes- you have to scroll down a bit to get to the round rechargeable lithium cells List of battery sizes - Wikipedia, the free encyclopedia