Nickel-metal hydride batteries have the same memory effect as nickel-cadmium batteries, but they are much smaller than nickel-cadmium batteries. Therefore, it is not necessary to perform a discharge operation every time (because the operation is improper, it will damage the battery), and it is only necessary to fully charge and discharge once every three months to alleviate the memory effect.
2. Self-discharge rate of nickel-hydrogen batteryNi-MH batteries are 25 to 35% (months), nickel-cadmium batteries are 15 to 30% (months), and lithium batteries are 2 to 5% (months). Ni-MH batteries have the highest self-discharge rate, while lithium batteries have very low discharge rates compared to the other two types of batteries.
3. Nickel-metal battery charging methodNiMH batteries and lithium batteries are not overcharged. Therefore, in the PICK CUT control mode in which the nickel-hydrogen battery is charged at a constant current, when the charging voltage reaches the maximum, the charging is stopped as the best charging method. Lithium batteries use the constant current and constant voltage methods to charge the best. If the nickel-cadmium battery charger-DV control method is used for charging, the nickel-metal hydride battery and the lithium battery will have the effect on the service life.
Different models of batteries, the higher the capacity, the longer the use. Aside from the factors of volume and weight, of course, the higher the capacity, the better.
But the same battery model, the nominal capacity (such as 600mAh) is also the same, the actual measured initial capacity is different: for example, one is 660mAh, the other is 605mAh, then 660mAh is better than 605mAh.
The actual situation may be that the capacity is high because the electrode material has more things to increase the initial capacity, and the electrode is used for stability. As a result, after a few dozen cycles, the battery with high capacity is rapidly depleted, and the capacity is low. The battery is still strong. Many domestic battery manufacturers often use this method to obtain high-capacity batteries. The user's standby time after half a year is a mess.
The civilian AA nickel-metal hydride batteries (that is, the fifth battery), generally 1400mAh, but also have the standard ultra-high capacity (1600mAh), the same is true.
The cost of increasing capacity is to sacrifice cycle life. Manufacturers are not in the context of the modification of battery materials, and it is impossible to truly "improve" battery capacity.
Nickel-metal hydride battery charging methodScientific charging methods can extend the life of nickel-metal hydride batteries.
1 Under normal circumstances, the new NiMH battery has only a small amount of electricity, and it must be charged and then used after purchase.
However, if the battery is out of factory time and the battery is very good, it is recommended to use it first. The new nickel-metal hydride battery is generally charged and used 3-4 times in order to achieve the best performance.
2 NiMH battery memory effect is small, it is best to recharge after each use, and is a one-time full, do not charge for a while and then recharge. This is an important point of "prolonging life."
3 When charging, pay attention to the heat dissipation around the charger. Keep the battery clean when not in use, especially at the ends, and use a soft, dry cloth if necessary. If it is not used for a long time, remove the battery from the battery compartment and put it in a dry environment.
4 NiMH batteries will enter a "sleep" state after a few months of storage, and battery life is greatly reduced. If the NiMH battery has been left for a long time, it is recommended to charge it with a slow charge first. Generally, before the charging of the nickel-hydrogen battery, the voltage is below 1.2V, and the normal voltage is about 1.4V after being fully charged. In this way, it can be judged whether the battery is already full.
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