The reason for increasing the internal resistance of nickel -metal hydride battery is that at the end of each charging, the chemical reactions of electrolyte water in the internal links increase the internal pressure. Although most of the gas can redefine the synthetic water, in the case of high pressure, there will still be. Some gases overflow through the safety valve. Over time, the interior is severely dehydrated!

　　The first step is completely discharged after taking off the battery

　　According to the battery condition, it can be directly circulated or using 1 European resistance to discharge to the end voltage near 0V, which usually takes 5-10 hours. In this way, it can prevent accidentally burn the battery in the short -circuit of the battery after adding water, and reduce the electrochemical corrosion during water.

　　The second step is to open the safety valve

　　There are four holes at the positive poles of brands such as Sanyo and SONY. You can directly see the rubber cap of the safety valve. Use a section of fine iron wire (I use the tube of the 1/4 resistance of the iron foot) to be bent into a U -shaped, and then insert it from the bottom of the rubber cap to the center position of about 2mm. In this way, the safety valve is forced to open it, and it is bent into a type to not damage the rubber cap.

　　Third -boiled nickel -hydride battery

　　Boil the battery with boiling water, wait until the positive pole is no longer bubble, but you cannot cook the battery !! immediately throw it into the cool (room temperature) pure water bottle, wait about 1 minute, some water is already some water at this time, some water has already been water. Inhale, then the bottle cap was twisted and squeezed the bottle for about 10 seconds, so that more water entered the battery.

　　Step 4 Plim out the battery

　　Take out the battery, dry it, pull out the U -shaped wire, the casing. It is best to use a large cross screw knife to match the small hammer to smash the position of the center of the positive hat to increase the sealing of the safety valve.

　　Repeat discharge

　　After 5 hours of placement, start repeatedly 3-5 times. The first charging first uses fast charging (Panasonic BQ390 I chose here) is about half an hour, and then charged with a slow charging (I use 100magP charging treasure) to the end voltage of 1.45V (very long), and then use medium speed at medium speed. Or a slow-speed charger (Sony's BC-CS2A).

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