The charging time of Tianneng 48v20a lithium battery is abnormally 3.5 hours.
It depends on the charging current of your charger. The formula for maximum charging time is: Maximum charging time (hours) = (battery capacity AH/charging current A) * 1.5. If you use the charger, the charging current is 5A, then your battery is 20Ah and the maximum charging time is = 20/5 x 1.5 = 6 hours.
Precautions for charging electric vehicles＜
1. Avoid exposing electric vehicles to high temperatures, and charging electric vehicles in high temperature environments is strictly prohibited. For safety reasons, do not charge outdoors on rainy days.
No matter the distance of the journey, charge it immediately after use and charge it as you go. Do not wait until the battery is completely exhausted beforee recharge it if the car is not used for a long time. times, make sure to charge it once a month, this not only protects the battery but also extends its lifespan.
How to calculate the charging time of a lithium battery
Take the example of a 48V100AH battery:
The current of charging is 20A, i.e. full charging time is 5 hours; divide the battery capacity by the current to get the charging time.
Discharge hypothesis: the power at the load end is 500 W
That is: 500 W (power at the load end) / 48 V (voltage rated) = 10.42A (current)
100AH (Battery capacity) / 10.42A (current) = 9.6 hours (working time)
According to battery standards, charging when the power is less than 20% is A-cycle charging. Full-cycle charging refers to a battery. After using 0%,recharge to 100%.
How long does it take to charge a 900 mAh lithium battery for the first time?
When calculating the formula, the charging voltage is not taken into account and the charging time is only related to the charging current:
Charging time t= battery capacity c/charging current i
So,
The theoretical charging time with a charger is 1320/350=3.8 hours, or almost 4 hours ;
The theoretical charging time with USB is 1320/800 = 1.65 hours, or approximately 1 hour and 40 minutes.
But in practice, the charging time is longer than the theoretical time because there is energy consumption during charging. Increasing the charging voltage can improve charging efficiency.
It depends on the loading method you use. Generally, the charging current of mobile phone lines is 400-500 mA, and a 900 mAh battery can be fully charged.completed in approximately 2 hours. If it is a pedestal charger, it depends on the output current of the charger. The formula for calculating charging time is: capacity ÷ current. The common universal charging current is between 150-250mah. If you use universal charging, it usually takes 4-6 hours. Lithium batteries have different characteristics from nickel batteries and do not require special activation. Therefore, don't believe what many people say that the first charge takes more than 12 hours. This is a misunderstanding and concerns the original nickel-metal hydride battery. In addition, the charging efficiency of lithium batteries reaches more than 95%, and you only need to charge them according to the calculated time.