How to repair the Ni-MH battery

The first step: completely discharge the battery after stripping, according to the current status of the battery, let the battery be directly short-circuited or use a 1 ohm resistor when the load is discharged until the terminal voltage is close to 0 volts, which is about 5-10 hours. This can prevent the battery from being short-circuited and burned out accidentally after adding water, and it can also reduce the electrochemical corrosion when immersed in water. Step 2: Open the safety valve. There are four holes at the positive electrode of the battery of Sanyo, SONY and other brands. You can see the rubber cap of the safety valve. Use a piece of thin iron wire (I used the iron foot 1/4 resistor pin) to bend it into a U shape. Then insert about 2 mm from the bottom of the rubber cap toward the center. In this way, the safety valve is forced to open, and it is bent into a U-shape in order not to damage the rubber cap. Step 3: Use freshly boiled water to scald the battery until the positive electrode no longer bubbles, but remember not to boil the battery, but to boil the water and then scald it. Immediately put it in a bottle of cool (room temperature) purified water, and wait for about 1 minute. At this time, part of the water has been inhaled. Immediately twist the bottle cap and squeeze the bottle for about 10 seconds to make more water enter the battery: Four steps: Take out the battery, dry it, pull out the U-shaped iron wire, and cover it. It is best to use a large Phillips screwdriver with a small hammer to slightly dent the center of the positive electrode cap to increase the sealing degree of the safety valve. It is enough to dent 0.5 mm. If you smash it too much, dangerous situations may occur. Step 5: After standing for 5 hours, start charging and discharging repeatedly 3-5 times. For the first charge, use fast charge for about half an hour, then use slow charge to charge the terminal voltage above 1.45V (it takes a long time), and then use a medium-speed or slow-speed charger. Part 6: Re-determining the capacity. Here it is first overflowed and left for 5 hours, and then used the ZB210 multi-function battery capacity detector to discharge at 1A cross-current to the end, and then the capacity (accurate to 10mAh, rounded) is marked on the battery with a paint pen. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to correctly choose lithium batteries for electric vehicles?