There is no electricity in Kamen Rider.
Kamen Rider memory battery is a kind of nickel-cadmium battery. If the battery is not fully charged and discharged for a long time, it is easy to leave traces in the battery and reduce the battery capacity. This phenomenon is called battery memory effect, which means that if the battery seems to remember the user's daily charging and discharging range and mode for a long time, it is difficult to change this mode and it can't be charged and discharged to a large extent. This effect does not exist in lithium-ion batteries.