Charging Method for 1.2V Ni MH Batteries

　　Charging 1.2V Ni MH (Nickel Metal Hydride) batteries requires a specific approach to ensure their optimal performance, longevity, and safety.

　　Firstly, it's important to use a charger that is designed specifically for Ni MH batteries. These chargers are equipped with the appropriate charging algorithms to handle the unique characteristics of Ni MH chemistry. One common charging method is the constant current charging followed by a constant voltage stage. In the constant current phase, a specific current is supplied to the battery. For most standard sized Ni MH AA or AAA batteries, a charging current of around 0.1C to 0.5C is often used, where C is the battery's capacity rating in ampere hours. For example, if a battery has a capacity of 2000mAh (2Ah), a charging current in the range of 200mA to 1000mA would be appropriate during the constant current phase.

　　During the constant current charging, the battery voltage gradually rises. When the battery voltage reaches a certain preset level, usually around 1.4V to 1.6V per cell, the charger switches to the constant voltage mode. In this mode, the voltage across the battery is maintained at this fixed value, and the charging current gradually decreases as the battery becomes fully charged. This two stage charging process helps to prevent overcharging, which can cause the battery to heat up, reduce its capacity over time, or even damage the battery.

　　Another important aspect is temperature monitoring during charging. Ni MH batteries can generate heat during the charging process, especially if they are being charged at a high rate or if there is a problem with the charger. Some advanced Ni MH battery chargers have built in temperature sensors. If the battery temperature rises above a certain threshold, the charger can adjust the charging current or even stop the charging process to prevent overheating. Additionally, it's advisable to charge Ni MH batteries in a well ventilated area to allow for proper heat dissipation.

　　It's also important to note that Ni MH batteries have a self discharge rate. After charging, if the batteries are not used immediately, they will gradually lose their charge over time. However, compared to some other battery chemistries, Ni MH batteries have a relatively low self discharge rate, but it's still something to be aware of. Storing charged Ni MH batteries in a cool, dry place can help to slow down the self discharge process.

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