The Ryobi charger will have constant red light on and when I put the Ryobi battery in it to charge the red light flashes and will not charge. What is the problem?

SOURCE: Battery charger light flash

Its pretty simple to fix. The lithium battery has just depolarized. Just buy a 9V battery.... put them end to end... the 9V and the lithium and touch the metal parts of them. hold for 20 seconds... if it doesn't work, lick the 9V to conduct the electricity better.. hold for 20 seconds and put directly on the charger... I just did this, and it is charging as we speak! good luck!

SOURCE: light on ryobi 18v charger

More than likely a defective battery sinse the other ones charge fine..
Bring it back for exchange of another one..

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SOURCE: Ryobi p111 charger -- light stays red

My charger do the same thing. I talked with the service people at Ryobi who said that the red led never goes out no matter how long you charge it. They suggested just charge it for 12 hours and then disconnect. Pretty dumb system, but that's apparently the way it is.

Bob Korsu

• 1051 Answers
• Posted on Mar 10, 2010

SOURCE: My battery will not charge. ( Ryobi 18.0v)

Bothights on indicates a problem with the battery. You cam try cleanibg the battery terminal with a Q-tip moistened with alcohol. Allow it to dry completly before tryin to recharge. If that doesn't work the battery may be defective or broken. If it was dropped that could cause the damage.

SOURCE: ryobi 18v lithium battery won't charge

sound to me like you have a bad battery, a lot of ryobi batterys don't last like they should i have had the same problem, but my battery was less than a year old and i took it back and they give me a new one.