The battery memory effect refers to the reversible failure of the battery, that is, the performance that can be restored after the battery fails. The memory effect is that the battery automatically maintains this particular tendency after it has been subjected to a specific duty cycle for a long time. This is the earliest definition of nickel-cadmium batteries, nickel-cadmium bag batteries have no memory effect, sintered batteries have a memory effect. Now nickel metal hydrogen (commonly known as nickel-hydrogen) batteries are not bound by this memory effect definition.
Recommendation 1: It is not necessary to discharge the battery before each charge, and it is harmful because the battery life is unnecessarily shortened. Recommendation 2: It is not advisable to discharge the positive and negative terminals of the battery with a resistor. The current cannot be controlled, it is easy to over-discharge to 0V, and even the battery polarity of the series battery pack is reversed.