Ryobi 18V lithium batteries show "test" light [blinking red] when placed in charger. Won't switch to "charge" [green blink]. Had a full charge when they came back to me after borrowed [with their charger] for a hurricane relief job in Louisiana -- volunteers may have tried to charge them in a ni-cad Ryobi charger?? Tried running them down and putting them back in charger -- same result.
I ran them down a bit then put them in the charger overnight and they kind of fixed themselves -- they finally showed a full charge and are acting normal now.
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Make sure that the 2 little charging prongs on the top of the charger are pulled out a bit. After a lot of use they become recessed and do not make contact with the battery.
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