How do you distinguish whether the 18650 battery is good or not?

2, press the battery rated voltage select gear, meet separately with the pens and the battery is negative. When the test voltage is larger and is equal to the rated voltage of battery label. The battery is in good condition. When test voltage is lower than 10% rated voltage, the battery can be used on the depth of discharge small electrical appliances. For example, quartz clock, with electrical appliances such as remote control. When the test voltage is lower than the rating of 20%, the battery did not use value.

3, need to remind, rechargeable battery voltage generally 15% 25% lower than the same battery category, case 5 # battery voltage of 1.5 V, 1.2 1.3 V and rechargeable batteries is only commonly, therefore, should be carefully confirm the rated capacity of the battery label.

If you want to accurately judge the stand or fall of battery, you must use the battery meter testing. If you want to quickly determine the battery have electricity, can use the method of measuring voltage of the battery, and open circuit voltage of lead-acid battery if less than 12.6 V means the battery without electricity, or broken.

Appearance test

Appearance without damage rust, etc

Voltage to judge

Use multi-meter to test the battery voltage, normal voltage of 3.7 v, such as the voltage is lower than 2.7 v, the probability of more than 90% are bad

Battery capacity test

If you have a charger with capacity display, you can look at the actual charging of the battery capacity, the capacity of 18650 is commonly between 2200-2800 mAh, if display capacity is low, show the battery capacity decline already exists, if the capacity is low, basic can do scrap processing

If there is no professional equipment, can also use some know the power of resistance, such as light bulbs to computing power, the power of 18650 (2400 mAh, for example) calculation formula is about 3.About 7 * 2.4 = 2.4 wh

Ready for multi-meter, multi-meter pens and contact, respectively18650 battery is negative, a simple voltage test, generally the real 18650 iron the lithium battery the voltage at around 3.20 V, of A product18650 lithium batteries voltage at around 3.8 V, bad 18650 fake batteries is generally low voltage or not, if a battery is false, then its output voltage of 0 V, according to a simple voltage test results will be able to distinguish between the stand or fall of the battery.

Three test methods to distinguish the stand or fall of 18650 batteries

Three test methods to distinguish the stand or fall of 18650 batteries

Ready to internal resistance tester, 18650 battery internal resistance test on inner resistance test fixture, fake 18650 batteries have no internal resistance or resistance is very small very small, but A product of 18650 battery internal resistance under 30 milliohm commonly, simple comparison according to the results of the test resistance can also distinguish the stand or fall of the battery.

Three test methods to distinguish the stand or fall of 18650 batteries

Three test methods to distinguish the stand or fall of 18650 batteries

3.If you want to more clearly area, respectively, the battery is good or bad, is ready for battery points should the ark, the battery which, after setting up working step and the corresponding specification book battery parameters, capacity test, points will be of A goods capacity is up to the standard.

Cobalt acid lithium

Single section is commonly: nominal voltage of 3.7 V [1]

Charging voltage is commonly: 4.20 V to 4.20 V / 4.35 V [2]

Minimum discharge termination voltage is commonly: 2.75 V

Maximum charging termination voltage: 4.20 V (Sanyo, Samsung, LG, etc. of the large capacity 18650 charging termination voltage of 4.30 V or 4.35 V, and Panasonic is still at 4.20 V)

Diameter: 18 + / - 0.2 mm

Height: 65 + / - 0.2 mm

Maximum capacity: 13 years can do 3400 mAh (3400 mAh Panasonic)

The lithium battery production this type of the world's biggest manufacturers have Sanyo (has been Panasonic), Panasonic, Samsung, SONY, etc.

Lithium iron phosphate

Single section is commonly: nominal voltage of 3.2 V

Charging voltage is commonly: 3.6 V

Minimum discharge termination voltage is commonly: 2 v

Maximum charging termination voltage: 3.65 V

Diameter: 18 + / - 0.2 mm

Height: 65 + / - 0.2 mm

Capacity: 18650 smaller than cobalt acid lithium, common 1500 mah

Compared with cobalt acid lithium lithium iron phosphate has the following advantages:

1: safer, overshoot discharge, discharge will not cause explosion

2: live longer, can normal use cycle more than 1000 times

3: big ratio, 2 c charge 10 c discharge, not burning, explosion, leakage, life would not be affected

But the lithium iron phosphate edition 18650 battery with low voltage monomer and more used in high current electrical work. Dynamic shape of cylindrical lithium ion batteries with 26650 is given priority to, because have greater capacity compared with 18650.

4: working temperature: - 20 ℃ to 50 ℃, the best working temperature is 20 ℃ and 40 ℃, and the human body comfortable temperature

One, usually said the three core battery is three quarters of 18650 batteries in series to form a battery pack. The battery finally identified parameters of 11.1 V / 2200 mAh.= 3.7 V to 11.1 V x 3, series when the output current constant.

Also has a standard 10.8 V, the voltage drop is a single batteries produced results in the decrease of total voltage.

Popular netbook market more specifications for this battery pack.

Two, four core battery has two kinds of circumstances: four series and two strings.

Four series battery finally identified parameters as follows: 14.8 V / 2200 mAh.= 3.7 V to 14.8 V x 4, still 2200 ma series when the output current constant.

Two series and four batteries is divided into two groups, namely two series and then parallel, battery finally identified parameters as follows: 7.4 V / 4400 mAh.= 3.7 V to 7.4 V x 2, the output current of 4400 ma = 2200 ma x 2.

Medium size notebook market (more than 12.1 inch, 13.3 inch, etc.) for this battery pack.

Six core batteries, generally for two and three series, namely six batteries is divided into two groups of all three, three three series after the parallel. The battery finally identified parameters of 11.1 V / 4400 mAh.= 3.7 V to 11.1 V x 3, with a total capacity of 4400 mAh = 2200 mAh x 2.

Some high specifications of the notebook have multi-purpose six cells.

There is battery having more than six cells, such as the nine cells.

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