I ordered a 510 kit from Electronicstix.com. It was their Electron 510. My first battery died, and I'm trying to recharge it. But it seems the battery is either incompatible with the charger I received, or I'm using it improperly. The charger has a red-to-green light to differentiate dead battery and fully charged. It's green (meaning fully charged), but it is still dead (LED flashes 10 times). Any tips? There doesn't seem to be anything in the manual.