Unless you are a bit clever with electronics, better off buying a new charger than trying to fix the internal circuit on it. here is some links to info ive found.
a new Ryobi 18v li charger will charge your nicad battery but a nicad charger will not charge li-ion battery.
http://powertool.manualsonline.com/manuals/mfg/ryobi/p110.html?p=1
http://manuals.ryobitools.com/documents/2101
SOURCE: Very little juice in freshly charged batteries
have you tried the batterys in any other tool?
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.
After that contact your closest Ryobi service center we would check that for free to let you know what you need, I am sure you local place would do the same.
SOURCE: When I charge my battery in my RYOBI P110 charger
I had the same problem, my understanding was that since the batteries are nic-cad, they have a memory so in short you are supposed to charge the batteries only when they are depleted. They have to be COMPLETELY depleted the first 3 or 4 times of use. I ended up replacing the two I had, followed this and have not had any problems since. Hope it works for you.
Bert
SOURCE: can I use the ryobi
No. The P110 is for NiCad batteries. Any of the Li-Ion chargers like the P113 are backwards compatible and can charge either but do not try to charge Li_ion batteries in a NiCad or NiHi charger.
SOURCE: I bought 2 P103 lithium
That is true the One+ 18V Li-Ion battery packs will work in any One+ 18V Ryobi tool. However the Lithium ion batteries will not charge in the original P110 NiCd charger. You will need one of the the new series Ryobi One+ 18V "dual chemistry" chargers for that. The will charge both types of battery packs.
SOURCE: Will the P110 charger charge a lithium ion battery
No, the P110, 18V NiCad battery charger, will not charge a 18V lithium ion battery. You need one of the dual-chemistry chargers. If you have the Ryobi ONE+ batteries, you can get the P117 charger ($30) or a charger with an extra battery (P126) from a store like Home Depot. A 6 battery charger and a 12V in-car charger are also available.
I wish that I had better news for you.
Cindy Wells
(who has the Ryobi 12V drill and charger, a few of the 4V tools, and a number of the ONE+ 18V devices and chargers. The single chemistry battery charger is not used much any more.)
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