I would agree that this could be a battery or charger issue. Unfortunately I've had both a Pleo RB charger and a Pleo RB battery fail on me at some point, and I'm not sure which would be more likely in this case. When the charger failed for me, it was the power cord that died, not the cradle, but I believe that charger no longer lit up at all when a battery was placed on it. In your case, it could definitely be a dead battery if the Pleo hasn't been run in years though.