The battery on my truck is almost dead. I want to give it a full charge. I have the charger set to 12 volts, 10 amps. It's been there for 3 hours and the "charge complete" light has not turned on. I have been reading and I keep seeing articles that say 30 minutes to 2 hours for a full charge. FWIW: 2003 Chevy 1500. battery is about 2 years old.