How to repair the damaged NiMH battery? After a certain number of cycles, NiMH batteries will face scrapping when their capacity and internal resistance are depleted to the point of unusability. However, most of the time, NiMH batteries do not reach the limit of their service life, and due to the self-discharge phenomenon of NiMH batteries themselves, many times NiMH batteries are damaged due to being placed for too long, and now we will introduce the repair process of NiMH batteries.
Specific steps for repairing NiMH batteries.
Step 1: Remove the outer packaging of the NiMH battery, then discharge the battery completely, use a 1 ohm resistor to short circuit the battery, and place the battery to 0V, a process that takes about 5-10 hours. This will stop the battery from accidentally short-circuiting and burning the battery after adding water, and will reduce the electrochemical corrosion when immersed in water.
Step 2: To open the safety valve, use a thin wire bent into a U-shape and then insert about 2 mm from the bottom of the rubber cap toward the center. This way the safety valve is forced to open, bent into a U-shape is to not damage the rubber cap.
Step 3: Use just boiling water to scald the battery, wait until the positive terminal is no longer bubbling, (but remember not to boil the battery, but to boil the water and scald.) Immediately put into a cool (room temperature can be) pure water bottle, wait about 1 minute, at this time part of the water has been inhaled, immediately screw the cap squeeze the bottle hard for about 10 seconds, so that more water into the battery: the
Step 4: Remove the battery, wipe dry, pull out the U-shaped wire, set of leather. It is best to use a large Phillips screwdriver with a small hammer, the center of the positive cap slightly smashed concave to increase the safety valve sealing degree, concave 0.5 mm can be, smashing more will have a dangerous situation.
Step 5: After 5 hours of placement, start charging and discharging repeatedly 3-5 times. The first charge is first charged with fast charging for about half an hour, and then charged with slow charging to an end voltage of 1.45V or more (it takes a long time), after which you can use a medium or slow charger.
Part 6: Resetting the capacity. Here is the first fully charged and placed 5 hours, then use "ZB210 multi-functional battery capacity tester" to 1A cross-current discharge to the end, and then the capacity (accurate to 10mAh, rounded off) with a paint pen on the battery.
After completing the above steps, does it feel like the battery has come back to life?
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