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Tiny, High-Current Rechargeable

Wolfman29

Wolfman29

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Hey everyone.

Essentially, I am working on, quite possibly, one of the smallest, CC but high-powered red lasers. However, I am in need of a small battery... one capable of providing roughly 275mA at most (without essentially shorting it.

However, my limits are roughly 10-12mm in diameter. Length isn't a big deal, but the smaller the better.

It also needs to be li-ion (not lifepo4, won't provide the voltage necessary)... any suggestions for quality, low internal-resistance li-ion batteries? I am doing searches while writing this, but may as well ask for assistance as well.

EDIT: Actually, the smaller the diameter the better (going to make the host one solid object for heatsinking purposes).

EDIT 2: Found out about 10180 li-ions and 10280 li-ions. These look ideal for me (good difference in diameter from the usual 12mm maximum. However, I can't find any protected versions of these cells (I would deal with extra length for protection), but I need them to be protected because there will be no protection mechanism from over-discharge while the laser is running and I don't want to go about killing batteries every other day or so.
 
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You could always install the protection mechanism into your host. The only downside is that you would have to isolate the case of the host. I have two builds that use unprotected 14250's, and have discharged them to about 3V without any problems recharging. The way I know the battery is low is when the output of the laser is noticeably dim.
Here's a link to a basic pre-built circuit:
http://www.batteryjunction.com/prcimopfor3l.html
 
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That's too big, unfortunately. And I suppose I could use unprotected cells. Now I just have to worry about current discharge. What is a safe maximum discharge for li-ions? Is it 2C or 3C? (if it's 3C I can use the 10180s, but if it's not I have to use the 10280s :( )
 
what about LiPo like for RC aircraft, helicopters, etc?

Same LiPo you find in a lot of bluetooth earpieces.
 
Hey have you tried an E cig Battery.?

They are 3.7v and depending on the length of the e cig the more mah you will get.

You will pay alot for 1 but it depend on how bad you want one.
Joye 510 Manual Batteries

Those are ~180mah.

You can get ones that are the same diameter but longer witch have ~280mah.

I have an old e cig battery. If you want i can take it apart and see whats inside. I cant remember exactly the size as the last time i took one apart was a year ago but i know its small in diameter.
 
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Well i think that is the cheapest you are going to get for a battery in that diameter or for what you are looking for.
 
I mean, I found a $6 10180, just not sure if it can provide what I need.
 
Oh. For some reason I thought LiPo were 3.2V. Will take that into account (just one LOC).
 
I took apart one of the E cig battery Here are a couple of pictures of the size of the battery next to a 10440.

This battery is not your traditional looking battery. It has solder tab and the battery is wrapped with some kind of foil like material.

682_2754.jpg


682_2757.jpg


Hope this helps.
 
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