Damage caused by the long time to place the restoration of nimh batteries

Source: 2020 - 04 - 11 any hits: time to repair damaged due to long-term storage of nimh batteries when a FinePix s1770 idle for eight months later, the camera camera use nimh battery can't charge. Charge after a few hours, just take a photo, the screen shows a dead battery, the camera automatically power off. Analysis and maintenance: the machine adopts four kevishen card 1. 2 v / 2300 mah nickel metal hydride batteries. Battery is relatively new, only used for 10 months, more than 2000 mah power before failure, under normal circumstances, a group of new nimh batteries can be used for more than two years, the battery should not doubt cancel damage, so I decided to repair it. First of all, the measurement of each battery in 1. The electromotive force (23 v emf) 。 The battery discharge 0. 3a( About 1 v) Later, in the 'delipo' charger. Measurement of each battery voltage is 1. 6 v, charging current of 150 ma. After measuring the battery charging 16 hours online terminal voltage of 1. 8 v, charging end. The battery from the charger, put eight hours. Voltage drop to 1. After 35 v, cameras to try. Took 154 photographs. Before this and failure in a photograph taken almost 167 photo. Repair effect is better, the repair method for readers reference. The original 'GJT talkback power charger adopts full automatic mode. When a single piece of the battery to 1. 44 v, the power indicator light will be automatically from red to green. Thus, the battery charger is not suitable for repair, because it has just started to make the battery charging, shortly after the red light turn green, the power cut off, 'delipo charger using artificial power supply. With 180 ma charger constant current charging after 16 hours, artificially cut off the battery. It is independent of how many volt terminal voltage increase, so it is especially suitable for repairing nickel metal hydride battery damage due to internal resistance increases. In this way, using 'delipo' charger for the battery pack for 3 ~ 5 times ( Taking pictures) , reduce the battery internal resistance, each index returned to normal, random charger can be used.