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Author Topic: Lithium drill batteries  (Read 810 times)

zahc

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Lithium drill batteries
« on: February 25, 2012, 11:24:04 PM »
I have a Ryobi lithium drill, and one of the batteries flashes 'defective' when I try to charge it. I measured the terminals and I'm still seeing 8V. I would like to revive this thing if I can. Do you think I can trickle-charge it back to a high enough voltage for the Ryobi charger to charge it?
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Nick1911

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Re: Lithium drill batteries
« Reply #1 on: February 25, 2012, 11:26:02 PM »
Umm... No?
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Brad Johnson

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Re: Lithium drill batteries
« Reply #2 on: February 25, 2012, 11:26:39 PM »
Are lithiums like NiCads, they can sometimes show voltage but be unable to hold a load?

Brad
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zahc

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Re: Lithium drill batteries
« Reply #3 on: February 25, 2012, 11:45:46 PM »
I'm sure that the charger's built-in charger IC is rejecting the battery because either it has too low of voltage, or something. The battery has 4 terminals, so I guess the other two are from more electronics in the battery itself. I'm thinking if I can just get the initial voltage up a bit then the Ryobi charger will take over, but I also don't want to burn my garage down.
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bedlamite

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Re: Lithium drill batteries
« Reply #4 on: February 26, 2012, 12:07:42 AM »
Lithium is not like Nickel. Once you discharge Li batteries below about 1.5-2 volts/cell, they will never recover.
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