how do you rebuild cordless power tool battery’s?

June 21, 2010

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7 Responses to “ how do you rebuild cordless power tool battery’s? ”

  1. William B on June 21, 2010 at 7:29 am

    replace the rechargeable batteries.

  2. Bert C on June 21, 2010 at 8:06 am

    Rechargeable batteries only last a certain amount of time. Once they are worn out they can not be “rebuilt”. If the battery is built you will need to replace the tool. If it has removeable batteries, buy a new battery for it.


  3. Sandyspacecase on June 21, 2010 at 8:37 am

    You can’t silly! Take them to a place like Tools-R-Us,so they can give you the correct batteries,and they will dispose of the old ones safely. You just can’t throw them out you know.

  4. Michael W on June 21, 2010 at 9:11 am

    It’s not that you can’t rebuild your cordless power tool batteries, its that it’s not recommended. If you do, it will very likely void any warranty for your tool.

    With that little disclaimer out of the way, lets have some fun shall we? If you were to unscrew the battery casing you will find several C or D like size batteries. Before you start anything you need to note down all the connections. The batteries are wired in series. You may need to remove the plastic shrink-wrap to see the connections. The batteries are connected to each other by either a small wire or flat piece of metal. You’ll need to figure out what is the voltage requirement is for each of the batteries. Just because they look or are the same size as regular store bought C or D size doesn’t mean they are they same. Hopefully the voltage is printed on the side. Then off to Radioshack or other electronics store and find a suitable replacement. Walmart probably won’t stock these. You could also try to find a similar C or D size rechargeable battery. You might not get that great of battery performance or rechargablity life. Make sure they’re rechargeable lithium-ion batteries, NOT ALKALINE. Then maybe use a zip-tie to bunch them back up and stuff them back into the battery case. Be sure you have the right polarity. If you did everything correctly, then everything should work.

    The same process can be used on laptop batteries as well. Why pay hundred of dollars for a replacement when you can refurbish your own?!

    Hopefully this gets you by for a while, but it would be best if you can save up for an actual replacement for just in case. Good luck

  5. The Plunja on June 21, 2010 at 10:09 am

    You can’t rebuild them just buy new ones.

  6. bobo on June 21, 2010 at 10:38 am

    Here’s an old navy trick… For Ni-Cad batteries; Carefully cut the battery pack open, check each battery, find the weak ones, use a 5 amp car battery charger and touch the positive charger clamp to the positive side of the battery and the negative clamp to the negative side of the battery for a few seconds. Do this a couple of times. Reassemble the battery pack and recharge it. Most times the battery pack will come back.

  7. bravoco101 on June 21, 2010 at 10:55 am

    if the batteries don’t hold a good charge anymore take them to like radio shack or someplace like that and they can recondition them

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