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Ryobi 18 volt battery wont charge

Have the standard ryobi 18 volt tool set, 3 of the 4 batteries wont take a charge any more. I have read some ways to bring the battery back to life. Is there a safe way to do this?

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  • Anonymous Mar 29, 2009

    fairly new ryobi batteries 18 volt wont charge hardly used

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  • 78 Answers

No its best just to replace them

Posted on Jan 05, 2009

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you would also need to check the voltage of the batterys they should be at least 18 volts (19 prefered)

then if the batterys do not show charged you would need to make sure the battery charger is putting out voltage.

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I also have a problem with the charging of Ryobi batterys. They seem to charge AOK with the green light coming on but the charge does not last at all. Not sure if the problem is with the batteries on the charger.

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Ryobi 18 volt batteries wont hold a charge


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:)

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