Ok I got my lincoln 12 volt grease gun. It said to leave it on the charger for 12 hours. I put it on for a few hours and the green light came on so i used it to grease 17 grease zerks. Now that i'm reading the book that came with it. It said it leave it on for 12 hours before use. it also said recharging the battery before it is about dead will reduce the total work life of the pack. So should I put it back on the charger overnight or run it down and then charge it overnight? i don't want to wreck this battery.