NiMH Batteries

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Complete Pack 2.jpg (33844 bytes) Complete Pack 1.jpg (33841 bytes)

This is one of my homemade NiMH battery packs. These deliver 4.5ah at 12volts and power our 10w HID dive lights for over 4-hours. 

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Two of these packs easily fit in a Dive Rite Wreck Canister for 9-hours of burn time in a very small package.

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New "4/3 Fat-A" cells with solder tabs (4500mah at 1.2v each). These cells were ordered from The NiCad Lady.

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Stacking the cells together into a 10-pack using a bit of Crazy-Glue to hold them in place. Caution-Insure they are oriented correctly as it's almost impossible to to separate them once glued. 

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Never solder to batteries without a heat sink. Here you can see me using a hemostat to isolate the soldering heat from the batteries.

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Once the pack is at this stage it's time to charge and burn test it. One pack I made was accidentally shorted during assembly (oops..). The good news is a total discharge doesn't hurt NiMH cells but I did need to individually charge each cell up to .8-1.0v before the automatic charger would work correctly.

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End plates cut from .060" HDPE

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First full charge on the Maha/Radio Shack (p/n 23-250) charger.

Click on the following link for a spreadsheet with detailed burn test data for my first NiMH pack. 

Burn Test 1.xls

UPDATE !!!

These packs have performed flawlessly. I'm now a complete convert and have been using NiMH cells (solder-tab and button-top) in a number of different applications with nothing but praise (underwater strobes, digital cameras, etc.).

I receive a lot of e-mail asking where I purchased my cells. Mine came from The NiCad Lady.

 

 

 

Questions and comments                Copyright 1997,2006 Brian D. Basura                This site was last updated 04/02/06