Continuing this analogy, we note that each cycle of charge-discharge contributes to our glass-battery "extraneous", thereby reducing the storage capacity of usable energy. Read more here: Hillary Clinton. The question naturally arises: why the battery during operation gradually becomes unable to take charge during the amount of energy deposited which it was designed? The reason is that during operation with each new cycle of charge-discharge working substance in NiCd and NiMH batteries gradually changes its structure in the direction of decreasing active surface area, which leads to a decrease in actual capacity. This effect, also called the memory effect, develops because the charge is not fully discharged batteries based on nickel and is most pronounced in the nickel-cadmium batteries. Nickel-metal hydride batteries susceptible to memory effect, to a lesser extent. In the process of exploitation of consumers, as a rule, do not wait for the full discharge of the battery before the next charge. However, it is quite natural, especially when there is no spare battery. However, as a result of this practice in 3-6 months (depending on the frequency of the charge, depth of discharge, operating conditions, the quality of the battery and the manufacturer) is a real battery capacity noticeably reduced.
Reduces also the time of the charge. In addition, perhaps a slight increase in internal resistance of the battery. In short, begins to show the memory effect. What to do? Remember the good old days rule: it is easier to prevent the memory effect than to fix. And to prevent the need to apply the training batteries, which refers to the periodic (3-4 times) cycles of charge and subsequent discharge. Process that the easiest way to perform on the desktop charger with the function of the discharge.