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How to revive a Black & Decker PS145 battery? Mine seems to take a charge ok but quickly looses its strength even if it is not being used. I beleive this is a NICAD type battery, therefore it builds a memory the more times it is charged, but I've also heard that these batteries can be rejuvinated. Do you have any information on how to go able doing this? Thanks!

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  • ka9ppa Apr 30, 2010

    Yes! Very helpful & very appreciated. A Ham Radio Convention is coming up and now I have something to add to my shopping list for the Flea Market!
    Thanks very much for the help!!! :)

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Ok, I make these pack of batteries all the time, it is quite simple really, you just need, Suitable Size, 1.2V Ni-cad's with Solder Tabs, (All Batteries are standard sizes, AA, AAA, B, N, C, are some of the sizes, all 1.2 Volts but differing mA/Hours, get the highest mAH you can get in that "Range". Then, simply join them up as the "Old" one, is wired up, usually they are all in series, but NOT always, simply draw out the existing batteries circuit, paying strict attention to Polarity. You can get the batteries from eBay, and they are quite inexpensive. Another way I do to "Rescue" a "Pack" is to use another good power supply, Current Limited, that can supply the "Charging" Voltage but at an Amperage of about 1 Amp. Now connect up the battery Pack to the Power Supply, and charge it up at about, 1/4 - 1/2 Amp for say Overnight, ensure they do NOT get too Hot, when charging. When finished, then use a suitable light bulb, and put it across the terminals, and leave on until, flat, and then leave it another hour or so, Now charge the Pack, up again, this time, at the end, you will have reconditioned your battery pack. Sometimes during this procedure, the batteries may "Fail" usually one or more go open circuit, this is GOOD, as now you have found your Faulty Cells, Now you can either just replace the faulty "Cells" in the assembly, OR simply make a whole new pack. Just make sure that any "Electronics" inside the batteries, is Transplanted as well, sometimes there is a Thermal Fuse, this can simply be bypassed with a wire, or replaced, as you wish. Anything else is just wired back in, as it was.

Posted on Apr 30, 2010

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