What is the Fully Charged Voltage of A 1.2V Ni - Mh Battery ?

1.2v ni-mh battery, the nominal voltage of this type batteries is 1.2v , which is also its discharge voltage platform. So what is the fully-charged voltage of nimh 1.2v batery ?According to a large amount of experimental data verified by nickel - metal hydride battery R & D and manufacturing personnel, the fully - charged voltage of a 1.2V ni-mh battery can reach up to 1.53V at most, but then it will drop back to around 1.4V.

The discharge cut - off voltage of a ni-mh battery is 0.9V. This means that when a ni-mh battery discharges to 0.9V, it is no longer convenient to use and should be recharged.

When a ni-mh battery is charged with a high - current, it may not be fully charged at 1.4V. Judging from the charging curve, for some ni-mh batteries charged at a 1C rate, the voltage can reach 1.53V when the battery capacity reaches 100%. Then, at this ni-mh battery voltage ,it turns downward and recovers to around 1.4V. Therefore, 1.53V becomes the maximum charging voltage.

The cut - off voltage of a ni-mh battery is 0.9V. Some ni-mh rechargeable batteries can actually be used down to 0.8V. If the voltage drops below 0.8V, it indicates that the ni-mh battery is over - discharged and needs to be repaired. If the battery still cannot reach 0.8V after repair (usually repaired by charging at a 0.2C rate for 1 hour), it means the battery has failed.

Estimation formula for the charging time of ni-mh rechargeable batteries

Charging time (H) = Capacity of rechargeable battery (mAh) / Charging current (mA) * 1.5 factor

For example, if you use a 1600mAh rechargeable battery and the charger uses a current of 400mA for charging, the charging time is: 1600/400 * 1.5 = 2.25 hours (Note: This method is not applicable to newly purchased or long - unused rechargeable ni-mh batteries).

Carry Zhang

sales02@liliangbattery.com

www.liliangbattery.com