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Rechargeable Batteries


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  #1  
Old 08-02-2015, 05:02:57 PM
JonH JonH is offline
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Default Rechargeable Batteries

Does anyone have any recommendations for rechargeable lithium aa/aaa batteries? I've got some relatively new NiMH's, but they have no shelf life. They've got to be charged just prior to use or else they'll be dead. I'm just wanting a straight-up replacement, not looking to have to cobble something together. I have read that lithium cells put out 3.7 volts per cell and either require only half the number of cells as regular aa's with the empty slots filled in with jumpers or a voltage regulator built into the cell to reduce it to 1.5v.

Any thoughts?

Thanks,
Jon
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Old 08-02-2015, 06:50:20 PM
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Default Re: Rechargeable Batteries

I thought the battery of choice now days was lithium-ion.......
Fast to charge, no danger of them short cycling due to developing memory and long life to boot.

http://batteryuniversity.com/learn/a..._ideal_battery
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Old 08-02-2015, 07:35:51 PM
Thaumaturge Thaumaturge is offline
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Default Re: Rechargeable Batteries

Jon, there are no official aa/aaa lithium cells. Lithium cells are designated by a five digit number and a mAh rating. AA size equivalent is 14500. 14 is the diameter in mm and 500 is the length. A good US source for rechargeable is. www.all-battery.com/li-polymersinglecells.aspx You will find lots of options there from custom packs to pouch cells.
Doc

Update: AAA equivalent is 10440.
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Last edited by Thaumaturge; 08-02-2015 at 09:08:14 PM.
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Old 08-02-2015, 07:56:39 PM
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Default Re: Rechargeable Batteries

I've had extremely good luck with "eneloop" brand rechargeable batteries in both AA and AAA size.

I've purchased mine off ebay. The newest ones are light & dark blue in the AA size and light & dark green in the AAA size.
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Old 08-03-2015, 11:49:50 AM
JonH JonH is offline
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Default Re: Rechargeable Batteries

Thanks guys. The only batteries I can find that match EXACTLY what I'm looking for are made by Kentli They are expensive and unfortunately, made in China. Kinda makes me skeptical of them.

Lithium or lithium ion makes little difference to me. I'm just tired of perpetually dead NiMH batteries. I do like the slow self-discharge rate on the Eneloops. May have to give them a try before I completely give up on NiMH.

http://www.metaefficient.com/recharg...ies-exist.html

Thanks,
Jon
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Old 08-05-2015, 03:10:38 AM
Thaumaturge Thaumaturge is offline
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Default Re: Rechargeable Batteries

Holy crap! $15 a CELL?

I'd rewire for a different battery configuration.
(exanple: 2x 10440 Li cells in paralell = 3.7 v out in same space as 2x AAA series = 3v out. Same idea for AA but using 14500 cells.)
Doc

If .7 volts too much a worry, series one 1N5401 diode, dropping 0.65 V more.
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Old 01-03-2016, 12:12:09 PM
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Photo Re: Rechargeable Batteries

is this for testing and practice posting pictures.trying to post pictures, this is a test. nothing to do with batterrys or spelling

Last edited by engine nut; 01-03-2016 at 12:13:21 PM. Reason: where is the post button for pics
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Old 02-08-2016, 11:29:18 PM
len k len k is online now
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Default Re: Rechargeable Batteries

I had a camera that used 2 AA alkaline cells, but with the display on it drained the bats dead flat in only 2-3 minutes. It was useless that way so I took a chance and used Lithium ion cells (4.1 volt). I salvaged some Lithium ion cells from a old laptop battery. I used 2 in parallel since that was the way they came. They make 4.1 Volts VS the ~ 3.1 volts of AA cell, works fine. But the cells were too large to fit inside the camera battery slots, so I used masking tape to hold them to the camera and connected it with wire.

Now instead of dieing in 2-3 minutes it's good for several months of occasional use. I just recharge them by connecting to 4.1 VDC for few hours till charging current drops off to ~ 0. My power supply can supply ~ 1.5 amps and when cells are dead charging current can be ~ 1 amp. I by-passed all the cell saftys so suppose I should make a better charger , but I put cell inside some cement blocks on cellar floor while charging for now.
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Old 02-14-2016, 08:51:27 PM
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Default Re: Rechargeable Batteries

I'd just get some Eneloops. They even usually come pre-charged at the store, so their self-discharge is very low.
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