The memory effect of rechargeable batteries, when the memory effect gradually accumulates, will greatly reduce the actual use capacity of the battery. To reduce the negative effect of memory effect, an effective method is to discharge. Generally speaking, because the memory effect of Ni-Cd battery is obvious, it is recommended to discharge it after 5-10 times of repeated charging and use, while the memory effect of Ni-MH battery is not obvious, so it can discharge it after 20-30 times of repeated charging and use.
The nominal voltage of nickel-cadmium battery and nickel-hydrogen battery is 1.2V, but in fact, the voltage of the battery is a variable value, which fluctuates around 1.2V as the power is sufficient. Generally, it fluctuates between 1V and 1.4V, and the voltage fluctuation range of different brands of batteries is not completely consistent due to different technologies.
To discharge the battery is to use a small discharge current to make the battery voltage slowly drop to between 0.9V-1V, and then the discharge should be stopped. If the battery is discharged below 0.9V, it will cause excessive discharge and irreversible damage to the battery. Rechargeable batteries are not suitable for use in home appliance remote controls because the use current of the remote control is very small. It is easy to cause excessive discharge if the remote control is used for a long time. After a correct discharge of the battery, the capacity of the battery will return to the original level, so when the capacity of the battery is found to have decreased, it is better to discharge it once.
A simple way to discharge the battery is to connect a small electric ball as the load, but you must use an electric meter to monitor the change of voltage value to prevent excessive discharge.
The choice of fast charger or slow constant current charger depends mainly on the focus of your use. For example, friends who often go out to use digital cameras and other devices should choose fast chargers. Do not place the mobile phone charger under humid or high temperature conditions, which will reduce the service life of the mobile phone charger.
There will be a certain heating phenomenon in the process of the charger. Under normal room temperature, as long as it does not exceed 60 ℃, it is normal to display and will not damage the battery. Because the style and charging time of the mobile phone are different, this has nothing to do with the charging performance of the mobile phone charger.