Ryobi 18v One+ battery won't hold a charge. I have two of them and neither one will hold the charge. The charger is the Ryobi 18v charger plus. I have the same problem. As soon as I put the battery in the charger (even if it is dead) the "charging", and the "fully charged" lights both come on. Even if I leave it for a day the battery will not charge.

hi Terry.
you could try homebase.or ebay will have them.
or this link should show you where you can buy them.
battery charger for ozito drill Google Search

Ryobi P115 is an 18V battery charger. However, Ryobi Manual did not mention the current rating of P115. if the current rating of Ryobi P115 is 50% higher than your 18V Lithium Battery it will charge. but if it's less than or equal, it will not.

I just went through this with Porter Cable 18V but I can't say it is the same for Ryobi. On the PC, all 18V batteries are interchangable on the tools, but the charging needs are different. A dedicated NiCad charger can't shouldn't be used for liOn but the later chargers will work for either battery.
Ryobi offers an 18V upgrade:
RYOBI Tools

would have paid you good money for that set.

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.

Hello, unless the charger specifies that it charges 18 volt, it will only charge a 14.4v properly. If the battery fits the charger physically, then the most you might get an 18v to charge at is 15 or 16 volts. Your battery life will be shorter and you might damage the charger. I hope this helps.

NO! Never charge lithium batteries in a charger designed for nickle based batteries like the NiHi your old charger was meant for. Ryobi did design the new Lithium charger to be backwards compatible so you can charge your older 18V NiHi batteries in the Lithium 18V charger.
Also note, NEVER miss-match the voltage, for example, make sure you are not trying to charge 12V batteries in an 18V charger unless the manufacturer has specifically stated that the charger is capable of multiple voltages.

In some model the FUSE got burn.But if this is not your case one or both,batts and charger are burn.Try first to change the batt, then if this not work, change the charger.

If both batteries won't hold a charge the problem may be the charger (not providing a full charge). If one battery is OK and one not holding a charge, the problem is probably a defect with the battery. I know there expensive, (I recently had to replace one for DeWalt).

Does it not hold a charge, or will the charge not indicate "fast charge"? I had to apply a initial jump charge on the battery to get it up to 20 volts, then I put it in the Ryobi Charger, and it started charging it.