The method to measure the quality of 18650 lithium battery is as follows:
1 Prepare a multimeter and touch the multimeter probes to positive and negative negative. 18650 battery electrodes respectively. Voltage test, generally the voltage of real 18650 lithium iron battery is about 3.20V, the voltage of grade A 18650 lithium battery is about 3.8V, fake 18650 battery is usually low voltage or No voltage, if it is a fake battery, then its output voltage is 0V. A simple comparison based on the voltage test results can distinguish the quality of the battery.
2. Prepare the internal resistance tester and place the 18650 battery on the internal resistance testing device for internal resistance testing. The fake 18650 battery has no internal resistance or the internal resistance value is very low, while A. The internal resistance18650 brand batteries are generally less than 30 milliohms. A simple comparison based on internal resistance test results can also distinguish battery quality.
3. If you want to distinguish the quality of batteries more clearly, prepare the battery capacity classification cabinet. After placing the batteries in the cabinet, set the working steps and parameters of the battery in the corresponding specifications to determine. the capacity. After testing, the capacity of product A after division by volume conforms to the standard.
Notes
At present, China's 18650 battery technology has a capacity of 2200, and many sellers incorrectly state that the lower battery capacity is 3000 in order to attract consumers or 3200 capacity, etc., to deceive consumers and get more benefits. Refurbished batteries come fromt of dismantled foreign batteries, obtained through illegal channels, then reconditioned and labeled with a false capacity. These batteries are advised to keep your eyes peeled as they carry with them explosive consumption.
I think everyone knows the word copycat. Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. the metal are very active. The processing, storage and use of lithium metal have very high environmental requirements. Manufacturers of counterfeit batteries may completely ignore these requirements, which can lead to danger at any time.
1) Check whether the electrical devices and battery contacts are clean, wipe them with a damp cloth if necessary, and install them with the correct polarity after drying (2) Do not don't mix themncians; and new batteries, models of the same type but different types of batteries cannot be mixed; (3) Primary batteries cannot be regenerated by heating, charging or other methods (4) Batteries cannot be short-circuited (5) Do not disassemble or heat; Battery ; (6) Use electricity The end of the device should be cut off after use, and the battery should be removed if not used for a long time.
A few years ago , I felt like the flashlight was dry. the battery drained too quickly, so I bought a bunch of AA and AAA packaged lithium iron phosphate batteries from a certain website - with it I bought twice as many reserved tubes - this one is quite interesting with which I bought too many hollow core batteries. a piece of wire inside. I tossed them aside and thought about replacing the batteries in the gas stoves and dare water heaters. My wife is cleaning her room and I don't know where she put it.At first when I was cleaning the room I found it and tested it and found that seven or eight batteries were all dead . The highest voltage was only 0.9V and the lowest voltage was 0.03V. One battery was completely dead. 0. I found an old lady winning the lottery on the street. The lipstick power bank was violently disassembled and used as a charger, and charged one by one. The power bank is not made of lithium iron phosphate. approximately 4.2 V from a ternary lithium battery. The termination voltage is about 4.03V. It can basically be charged, which is 0. I have charged the tablet several times but it still cannot be charged. should be thrown away.
After leaving it alone for three days, the voltage of two of them dropped below 1V, whileall others remained above 4V. These two tablets should have an internal micro short circuit. or something like that. Because of the leaking problem, I removed two batteries and two spare tubes, and replaced the four batteries in the gas meter that I hated so much. It should be replaced after three to five months. the problem is that the residual voltage of the used battery is higher than 1.4V!), the water heater has been replaced by forced draining, and no battery is needed. The gas stove uses D batteries, and I can't find any. one right now. I replaced the clamps and used them less, so I continued using two suspected leaking batteries, charged them fully and left them for three days. They didn't drop below 1V. Then I recharged them. I left them for a week and they were still above 1V. I recharged them several times, after havingleft alone for a month there is still more than 3V, interestingly I charged it once when I remembered. It has been left alone for over a month and the voltage is 3.71V, 3.65V. There should be a leak - a battery for comparison. After more than six months without charging, the voltage remains at 4.01 V (I). I will wait until next year when the temperature is above 25°C to reconstitute it). I suspect there is a leak in these two tablets, so I will charge and discharge them for a few more cycles to check. If it can be repaired, a message report will be issued again.
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