Repair of Ni-MH batteries damaged due to prolonged storage

Repair the Ni-MH battery damaged by long-term storage. When a FinePixs 1770 camera has been idle for 8 months, the Ni-MH battery used in the camera cannot be charged. After charging for a few hours, only one photo was taken, the screen showed that the battery was dead, and the camera automatically shut down. Analysis and maintenance: This machine is powered by 4 kevishen brand 1.2v/2300mAH nickel metal hydride batteries. The battery is relatively new, only used for 10 months, there is more than 2000mah of electricity before failure, under normal circumstances, a group of new nickel-metal hydride batteries can be used for more than two years, the battery should not be suspected of canceling the damage, so it is decided Fix it. First, measure the electromotive force (emf) of each battery at 1.23v. After the battery is discharged for 0.3a (about 1V), it is charged in the delipo charger. The measured voltage of each battery is 1.6v, and the charging current is 150mA. After 16 hours of charging, the online terminal voltage of each battery was measured to be 1.8v, and the charging was completed. The battery is removed from the charger and left for 8 hours. After the voltage drops to 1.35v, it is loaded into the camera for trial shooting. 154 photos were taken. This is similar to the 167 photos taken with one photo before the failure. The repair effect is good, and the repair method is for readers' reference. The original GJT intercom charger uses a full-charge automatic power-off mode. When a single battery is charged to 1.44v, the indicator light will automatically turn off from red to green. Therefore, the charger is not suitable for repairing this set of batteries, because it has just begun to charge this set of batteries. Soon after the red light turns to green light, the power is cut off, and the delipo charger uses artificial power. After 16 hours of constant current charging with a 180mA charger, the battery was artificially cut off. It is independent of how many volts the terminal voltage increases, so it is especially suitable for repairing metal hydride nickel batteries damaged due to increased internal resistance. In this way, use the delipo charger to charge and discharge the battery pack (photographs) for 3 to 5 times. After reducing the internal resistance of the battery, all indicators return to normal, and the random charger can be used. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Can aluminum batteries replace lithium batteries?