Most digital equipments are use nickel-metal hydride batteries. You need to master the following main points.
1, adequacy. Adequate charge the battery is the main function of charger, to what adequacy, 50%, 70%, 90%, or 100%, which reflects the battery capacity utilization. 2000mAH Ni-MH batteries charge to 50% is just like a 1000mAH battery.

2, versatility. Charger for battery capacity range reflects a common level, of scope of smaller application  charger, when the user has an earlier smaller-capacity battery or a new purchase higher-capacity battery, which require to purchase multiple chargers. Versatility of the charger or even just one will be able to adapt to large range of battery capacity, not only could apply to earlier, the current battery capacity, but also to accommodate future higher capacity battery.

3, the control mode. Artificial control of charging time, in actual use, people often negligence and lead to overcharge, automatic control of charging is very convenient for users.

4, fast charge performance. Charger to provide fast charge or hasty charging current, with a relatively short time sufficient battery, very easy to use.

5, charging power supply. Ni-Cd, Ni-MH battery should use constant current source charger.

6, daily charge capacity. Chargers 24-hour maximum charge capacity reflects the capacity of the charge. 100mA charge current, charge two battery chargers, daily charge capacity is 3200mAH, 100mA recharge 4 battery charger, daily charge capacity is 6400mAH, 300mA recharge 4 battery charger on charging capacity of up to 20000mAH, the higher the daily charge capacity, the more capable it becomes.

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