For nickel-cadmium (CdC) lithium-ion batteries, the electrolyte should be replaced after 100 charge-discharge cycles. For lithium-ion batteries that are not frequently used, the electrolyte should be replaced annually. If the capacity of the lithium-ion battery decreases significantly, the electrolyte replacement interval should be shortened. For nickel-iron (FeI) batteries, the electrolyte should be replaced every 50 charge-discharge cycles, and generally no less than twice a year depending on climate changes.
The electrolyte in nickel-cadmium lithium-ion batteries should be replaced using the following method: First, discharge the batteries at an 8-hour rate to reduce the voltage of each battery to 1.0 volt. Pour out the electrolyte and then wash the batteries with pure water until no residue or sediment is left in the water. Then, inject the newly prepared or regenerated electrolyte into the batteries. Note that under no circumstances should the batteries washed with pure water be immediately refilled with electrolyte; even short-term rest is not permitted. After injecting the new electrolyte, tighten the stopper and allow it to stand for 2 hours. Then check if the specific gravity and liquid level of the electrolyte meet the requirements and adjust as necessary. Finally, add an appropriate amount of liquid paraffin and tighten the stopper.
Before replacing the electrolyte in a nickel-iron lithium-ion battery device, discharge it with an 8-hour rate current to reduce the voltage of each battery to 1.0 volt. Remove the old electrolyte and shake the device vigorously to dislodge any residue. After removing the old electrolyte, rinse it 3-4 times with the removed residue-free old electrolyte. Pour in freshly prepared or regenerated electrolyte, let it stand for 2 hours, check the specific gravity and liquid level, and adjust accordingly to reach the specified values. Then, add an appropriate amount of liquid paraffin and tighten the stopper.
