Answer: the standard charge and discharge of NiMH battery specified in IEC international standard are: first discharge the battery to 1.0v/pc at 0.2C, then charge it for 16 hours at 0.1C, put it aside for 1 hour, and then discharge it to 1.0v/pc at 0.2C, which is the standard charge and discharge of the battery. That is to say, the battery can be used to the maximum extent without damage.