1, the original lamp charger: according to the conventional lead-acid battery, the general charging current is 10% of the rated capacity, that is, 10 hours full. If it's a lithium battery with a fast charge function, it takes about three or four hours. 2, non-lamp charger: look at the charging current (mA) of the charger is how much, and then look at the battery capacity (mAh), the battery capacity divided by the charging current is the full charge time (hours). 3, the above two points are general estimates, if you want to calculate accurately, you need to calculate the actual measurement