Lifehack/toolhack - Ryobi lithiums, probably others.
Some rechargable lithium powered tools can, when stalled on a tough piece of work, pull the battery voltage too low and the smart chargers will read them as defective/unchargeable. Apparently there is a chip inside the battery that reports to the charger. You check these pricks and they read 4-6 volts.
The hack(as found on Internet). Take a fully charged battery, connect it's negative to negative of "Bad" battery, ditto with positive.
CAVEAT!!! Only make contact for 1 second max. Seriously - lithiums can dump their power really fast and this is a trifle hard on "bad" battery. Just one second will usually bring them up to reading 12-14v(I'm assuming amperage is low). They now will charge and work just fine.
Some rechargable lithium powered tools can, when stalled on a tough piece of work, pull the battery voltage too low and the smart chargers will read them as defective/unchargeable. Apparently there is a chip inside the battery that reports to the charger. You check these pricks and they read 4-6 volts.
The hack(as found on Internet). Take a fully charged battery, connect it's negative to negative of "Bad" battery, ditto with positive.
CAVEAT!!! Only make contact for 1 second max. Seriously - lithiums can dump their power really fast and this is a trifle hard on "bad" battery. Just one second will usually bring them up to reading 12-14v(I'm assuming amperage is low). They now will charge and work just fine.
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