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 Laser Pointer Forums - Discuss Laser Pointers 3.2V Lithium Iron Phosphate batteries...how to charge???????

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05-02-2011, 06:04 PM #1
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steviedezie
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3.2V Lithium Iron Phosphate batteries...how to charge???????

I got some 18500 and 14500 sized lithium iron phosphate batteries from walmart that I was planning to use in a few builds. they have a 3.2V charge so normal Li-ion chargers wont work. I have an adjustable regulated power supply and I was planning to use it to charge the batteries through a simple constant voltage circuit.

anyone has a schematic for that circuit on hand? I've been on candlepowerforums and still no luck. It would be nice if i didnt have to buy a seperate charger just for 3.2V batteries. I believe at full charge they sit around 3.4-3.5V.

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05-02-2011, 06:30 PM #2
 Class 3R Laser Join Date: Apr 2011 Location: Andorra Posts: 1,280 Rep Power: 184
piferal
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Re: 3.2V Lithium Iron Phosphate batteries...how to charge???????

lithium iron phosphate (LiFePO4)

min. discharge voltage = 2.8 V.

Working voltage = 3.0 V – 3.3 V.

Max. charge voltage = 3.6 V.

Fast charge current: 4C or less

See if this helps

Last edited by piferal; 05-02-2011 at 06:32 PM.

05-02-2011, 06:42 PM #3
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steviedezie
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Re: 3.2V Lithium Iron Phosphate batteries...how to charge???????

ah thanks for that. While im not going to use that IC, it does give me an idea of another IC I can use. I was hoping to build some simple circuit like the DDL using a lm317 ( i got a lot of those lying around). wow those suckers can handle 4C charging??? thats like 15 minutes.

05-02-2011, 07:22 PM #4
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piferal
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Re: 3.2V Lithium Iron Phosphate batteries...how to charge???????

Quote:
 Originally Posted by steviedezie ah thanks for that. While im not going to use that IC, it does give me an idea of another IC I can use. I was hoping to build some simple circuit like the DDL using a lm317 ( i got a lot of those lying around). wow those suckers can handle 4C charging??? thats like 15 minutes.
I know of no equivalent of this IC, this is a specific IC to charge these batteries, sorry.

Yes because the Lithium iron batteries stay much cooler tan the Li-Ion, maybe not in 15 min, but close.

And the materials are non-toxic.

you have the option to buy a charger for about \$ 25, I know one that is widely used in Hobby Aeromodelling.

It can charge almost all type of batteries.

05-02-2011, 07:32 PM #5
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steviedezie
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Re: 3.2V Lithium Iron Phosphate batteries...how to charge???????

would they have this IC at mouser or digikey?

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