Originally Posted by 01 CAt Man Do

First question, No, the lamp is designed to stop charging when the battery is fully charged, even if left plugged in. Five hrs would be the typical time to charge if the battery is fully depleted. Yes, there is overcharge protection.

Please note, it is best if you charge the lamp ASAP after you have ridden more than three hours. Deep discharge makes a Li-ion battery age faster. Okay if it happens once in great while but try not to do too often. Regardless if you use the lamp a lot the battery will lose capacity over the years as others have suggested. In cold weather you want to charge the lamp after every ride. Small batteries hate cold weather and tend not to run as long when exposed to cold temperatures. Never recharge a Li-ion battery until after it has returned to normal room temperatures.