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Ryobi 18 volt batteries wont hold a charge

My semi-new 18 volt ryobi batteries will no longer ''hold'' a charge. how can I recondition or ''bump'' them so that they will work again. most of my hand and power tools use this battery. thank you for you help, (in advance)

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  • somebuddy2b1 Nov 25, 2008

    P100 18 volt, the number on the bottom of the battery is: G0451. hope this helps!

  • somebuddy2b1 Nov 25, 2008

    they are ni-cads.

  • aubdavis Jan 31, 2009

    dewalt 18 volt ni mh wont hold a charge.

  • jgarry1001 May 01, 2009

    i have the Ryobi 18 v battery Ni Cd model # 1322401, for 3 years, and have not used either of the batteries for a total of more then 1 hour, , now they will not charge, the yellow charge light and the GREEN full charge lights are both on?? right away?

    maybe i should totally run the battery down with drill etc, then recharge??????



  • yadayada
    yadayada May 11, 2010

    In order to give the right info to your question I need to know the type of battery, nickel cadmium, nickel metal, lithium ion, not model but chemical type of the battery, it will say on the battery.

  • yadayada
    yadayada May 11, 2010

    These are what type of battery, nic-cad?

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Ryobi batteries are specific to each Ryobi model, so please write down which model number or the original battery part number you have. How old are the batteries?
I had the same problem with many bateries I had at home, like cell-phone batteries and also some power tool bateries. Did not have any Ryobi power tools tho, so don't hold me acountable if this doesn't apply to your hardware:)
Many batteries have the "memory effect" which means that if the battery was not completely empty when it was set to recharge it might now only recharge to the level it was emptied to, so for instance if you used the power tool for 10 mins and the battery emptied to, lets say, 90% capacity, it might occure that the next time you recharge the battery it will only charge to it's 90% maximum...doing that many times lowers the maximum recharge capacity. As I heard the new Li-Ion batteries do not have this problem.
I hope this makes some sence as my english is not that good and it was a bit hard explaining my thoughts:)

Posted on Nov 25, 2008

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  • Hand Tools Master
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I CAN TELL YOU RIGHT NOW THE BATTERY IS NO GOOD, THIS ASSUMES YOU HAVE TESTED THE CHARGER VOLTAGE AND IT IS WITHIN SPECS.

Posted on Nov 25, 2008

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