Harbor Freight 2/10/50 Battery charger. Item # 66783 it says it is a manual charger. and is not available any more the current #60581 says this from the instructions
When the battery is fully charged and registering 100% on the Charge Meter, a small charge will continue to move from the charger to the battery. If the charger is not disconnected from the battery, eventually heat build up will cause the battery acid to boil and overcharge the battery causing damage to the battery. Monitor battery charging progress constantly and if battery gets warm, stop charging it immediately.
and this
Although this charger has an automatic cut off; do NOT depend solely on automatic cut off. Leaving charger unattended can result in fire and property damage.
