Generally, the new battery is normally fully charged, and it is not urgent to refuel or brake during driving, and it should be able to run to forty to fifty kilometers on the normal flat road. Pay attention to the good points in driving can also be more. Charging time is 6-8 hours, full charger automatically into floating charge, the so-called floating charge refers to trickle charging, the current is very small, you can pull out the charger, if it is charged at night, it doesn't matter if it is full, the same in the morning. The distance of full charge riding is not long, then the time of recharging is short, if the discharge is relatively deep, such as you run out of electricity, the charging time is very long, can be as long as 10- 15 hours, lead-acid battery is best not to run out of electricity, otherwise the life is shortened. A set of original batteries can generally be used for two years, and the cycling mileage can reach 10,000 kilometers.
48v20a charging time of 3 hours is not normal, generally 48v20a battery charging time is 8 to 10 hours, charging 3 hours full indicates that the battery has been aging, or the time has been used for a long time, the capacity of the battery is reduced, it may also be a loss of power, a full charge, a use of no power, such a battery should be replaced with a new, It's hard to fix,
It's not normal. It'll burst the battery. It's too short a charge!