18650 battery is a regular type of battery, and it is very common in daily life, how much is the remaining capacity of 18650 battery is a concern for many people, how to accurately measure the capacity of 18650 battery? Now I will share several 18650 battery capacity test methods to everyone, to facilitate the use of non-professional methods to quickly assess the battery capacity.
18650 lithium battery is a very common standard size lithium battery, widely used in digital 3C products, electric bicycles, electric tools and many other industries and fields, its unique safety can ensure that in extreme environments do not catch fire and explode, compared to the polymer lithium battery, the cylindrical 18650 lithium battery is more secure.
At the same time, because of the high utilization rate of 18650 single cell battery, for a period of time, the capacity of single 18650 battery sold through e-commerce platform is not marked according to the required capacity, and the phenomenon is getting stronger, although the known maximum capacity of 18650 lithium battery can only reach the limit of 3500mAh, the market is still flooded with 5000mAh, even 8000mAh So how can we identify the fake capacity of 18650 lithium battery? The following lithium battery PACK factory describes several 18650 lithium battery capacity test methods.
Standard method: Use battery capacity tester to measure, in a constant temperature environment (25℃) first charge the lithium battery to 4.20V, set aside for 1 hour to 0.2 times the constant current discharge, for example, 1000mAh capacity, 200mA constant current discharge discharge to 2.75V cut-off (or according to the corresponding model specification of lithium battery discharge cut-off voltage), calculate the time time * constant current Current = Battery capacity. This is in accordance with the national standard lithium battery regulations standard method. If it is a NiMH battery, the same thing. Discharge and fill the way in accordance with the standard NiMH batteries can be. There are some chargers on the market that can measure the battery, and their built-in program can automatically calculate the capacity of the battery by discharging through constant current. However, the accuracy rate is not high, but the results can still be used as a reference. The main reason for this is because of the hardware accuracy limitations, and not in a constant temperature environment. The difference of temperature will have a large impact on the capacity of lithium batteries. After the test results show that when the difference in ambient temperature is 10 ℃, the test out of the battery capacity there is a large error.
(Non-professional method I): use a charger with a record of charging capacity to charge the battery without electricity, if the capacity charged is not as high as the capacity marked on the battery, you need to be alert to the possibility of a fake battery, of course, the capacity charged does not represent the actual capacity of the battery, but as a reference enough, usually, the capacity of the battery charged is 500-1000mAh greater than the actual capacity of the battery or so. This has something to do with the capacity of the battery itself.
(Non-professional method 2): Use a smart battery charger with a discharge function for charging and discharging measurement, the results from this method are closer to the actual capacity of the battery. Now on the market very accurate chargers can achieve within 3% of the measurement error.
(Non-professional method three): In the absence of any equipment, we can also be calculated by manual measurement, such as the use of light bulb discharge or equipment discharge, using the rated W number of light bulbs linked to the battery, to the lithium battery power consumption, record how long the total discharge, according to the power and discharge time can also record the approximate capacity of the lithium battery, this result is only approximate. But used to find fake batteries as well as rubbing.
(Non-professional method IV): use the load meter, record the discharge time, you can also calculate the corresponding capacity, this is also a more reliable way.
18650 batteries are widely used, almost everywhere in daily life, so we need to pay attention to the quality of the 18650 lithium batteries used as well as safety, the methods described above can at least allow users to identify fake lithium batteries. How to screen and how to use electronic devices safely in daily life is a point of knowledge that all users should understand and learn.
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