Try another battery in the charger
SOURCE: battery charger
Take your charger out on a boat and dump it into the sea. Then go to the store and buy a new one.
SOURCE: can a bad ryobi 18 drill ruin a new 18volt ryobi battery
If the drill has a short in it, then yes, it could short the battery out. Probably in the trigger switch.
SOURCE: plug battery in and lights don't go on
The battery is failing and is starting to degrade. If you can't get it to take a full charge, you might want to mark it for use in your flashlight only, but eventually, the battery won't take any charge and you'll have to replace it.
The good news is the the Ryobi battery tools have the lowest cost of rechargeable batteries in the marketplace. I believe you can purchase a 2 pack at Home Depot for under $40.00 which is very inexpensive for two (2) Ni-Cad batteries.
If you battery is from a new tool set, just simply contact Ryobi Customer Service and they'll address the problem with a replacement. If the batteries are ones you've been using for awhile, then go for the replacement.
NiCad batteries should be used until the tool slows down to the point where you can't use it. Then remove the battery from the tool and allow it to cool down for about 15-20 minutes before placing it in the charger. This will provide the maximum working life for your batteries.
When you use a battery powered tool, the battery gets warm/hot as it discharges, and then it gets heated up during the recharging process, so letting it cool down after using it, will prolong the useful life of that battery.
Hope you find this Very Helpful and best regards!
Testimonial: "Thanks for confirming my thoughts. I hadn't thought of letting the batteries cool down between discharge/recharge cycles."
SOURCE: Ryobi Model 1412001, 16vdc, 2A
Same thing was happening with my Ryobi 18V Nicad Charge + batteries. I boujght a 18V Chicago Electic quick charger from Harbor Freight tools, and just jumped the wires to the battery while monitoring the voltage with my meter. It started around 9v, and while the Ryobi Charger did nothing, the Chicago electric charger cycles on/off repeatedly till the voltage goes up to around 20 volts or so. At that time, I simply put the battery in the Ryobi Charger and it instantly went to the red "fast charging" mode. Seems it needs some decent battery in the battery before it will actually charge it. FYI. the charger from Harbor Freight #43933 cost me $4.95 !
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
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