Have the Ryobi 40 Volt battery system. Off full charge the battery ran for several hours. Now on charger, I get just red flashing or red/ green flashing. Is it the battery or the charger?

SOURCE: 18 volt ryobi battery charger...green & yellow lights come on wha

talked to Ryobi and they are vague. It can either mean that the battery is bad, or the charger is bad and another one that maybe the contacts of the battery are dirty or not seating fully in charger. What I would look for in this instance first unplug the charger and look into charging slot to make sure the terminals of the charger are not bent and they come out into the cavity where battery would go. If not gently pull terminal into opening and retry. Sorry I couldn't be of more assistance

SOURCE: Battery Charge light flashing 4 red one green Dell Inspiron 9200

usually, its an indication that the battery is nearing the end of its useful life. you can try to use another battery to isolate it further. If the same thing happens with another battery, chances are, the mobo is failing. Flashing the BIOS can usually help with battery issues. If another battery works fine and your computer is within its first year since you bought it, you can request a replacement battery from Dell

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: when charging battery flashes red then stays on

it doesn't change to green, the solid red light means it is fully charged, there should be a legend on the front of the charger to help you with this. If it flashes real fast the battery is malfunctioning and slow flashing is charging and again solid is fully charger.

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.