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One of two 12 volt battery packs from my factory refurbished cordless Ryobi drill recently failed.A 24 hour recharge yielded hardly 15 seconds of work.Finding that a new 12 volt battery pack was from $34 to 49 dollars gave me impetus to dissect the bad battery pack.
I found in it 10 smaller batteries,each that when charged should yield 1.2 volts.Ten small batteries when charged yields 12 volts.My digital mutimeter confirmed all but one to be fully charged.That one battery held less than .4 volts.I reasoned that this battery had failed and shorted the remaining series of batteries.My Radio Shack catalog advertised two batteries that appeared to be replacements.The one I chose was #23-190,a package of two batteries,at $7.99
I tried desoldering the bad battery from it’s connector but was forced to use wire cutters.I salvaged as much of the electrical connector as possible to both sides of the unit.I then prepped both sides of the replacement battery with sand paper and flux and soldered it between the other batteries.Then back to the charger.
Twelve hours of charging yielded 13+ volts;the same as my other pack.So far I,ve gotten 2 hours of work out of the renewed battery pack.All at a cost of about $4.Hope this helps some of you on a low budget!!
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One of two 12 volt battery packs from my factory refurbished cordless Ryobi drill recently failed.A 24 hour recharge yielded hardly 15 seconds of work.Finding that a new 12 volt battery pack was from $34 to 49 dollars gave me impetus to dissect the bad battery pack.
I found in it 10 smaller batteries,each that when charged should yield 1.2 volts.Ten small batteries when charged yields 12 volts.My digital mutimeter confirmed all but one to be fully charged.That one battery held less than .4 volts.I reasoned that this battery had failed and shorted the remaining series of batteries.My Radio Shack catalog advertised two batteries that appeared to be replacements.The one I chose was #23-190,a package of two batteries,at $7.99
I tried desoldering the bad battery from it's connector but was forced to use wire cutters.I salvaged as much of the electrical connector as possible to both sides of the unit.I then prepped both sides of the replacement battery with sand paper and flux and soldered it between the other batteries.Then back to the charger.
Twelve hours of charging yielded 13+ volts;the same as my other pack.So far I,ve gotten 2 hours of work out of the renewed battery pack.All at a cost of about $4.Hope this helps some of you on a low budget!!