How long does it take to charge the 18650  rechargeable lithium battery? Shared by 18650  lithium ion battery supplier.

If the output is 350 ma, your battery charging time is: the battery capacity * 1.5/350, for example, your 18650  rechargeable lithium battery capacity is 2400 mah, namely 2400 * 1.5/3500 = 10.28 (h), but now the lithium battery charger of light above doesn't work due to some special reasons, you may use your meter test your battery voltage, if the voltage of 4.2 V to 4.3 V range, shows that the battery is fully charged, now more than 95% of lithium battery charger with protection, and generally 18650 lithium In the majority with 2000 mah - 2600 mah battery, so you the charger after charging for more than 10 hours, basically can be full of, also need not consider overcharge problem. Battery charger fever is common now, if your battery temperature is lower, also means that the charger has not used to recharge the battery, the battery in the early stages of the charge, a period of time (0 to 6 hours) is hot, the other is the link you give not to open, don't know what kind of charger you use.

The charging process of lithium ion batteries can be divided into four stages: trickle charge (low-voltage precharge), constant current charge, constant voltage charge and charge termination.

The basic requirements of lithium battery charger are specific charging current and voltage, so as to ensure the safe charging of the battery. Other charging auxiliary functions are added to improve the battery life and simplify the operation of the charger, including trickle charging for over-discharged batteries, battery voltage detection, input current limit, turn off the charger after charging, and automatically start charging after partial discharge of the battery.

Calculation of charging time and discharging time of 18650 lithium battery:

Phase 1: trickle charge - trickle charge is used to precharge a fully discharged battery unit (recovery charge). When the battery voltage is lower than about 3V, trickle charge is adopted, and the trickle charge current is one tenth of the constant current charge current, i.e. 0.1c (for example, if the constant charge current is 1A, the trickle charge current is 100mA).

Stage 2: constant current charging -- when the battery voltage rises above the trickle charging threshold, increase the charging current to carry out constant current charging. The constant charge current ranges from 0.2c to 1.0c. The battery voltage increases gradually with the constant current charging process. Generally, the voltage set for a single battery is 3.0-4.2v.

Stage 3: constant voltage charging -- when the battery voltage rises to 4.2v, the constant current charging ends and the constant voltage charging stage begins. According to the saturation degree of the cell, the current gradually decreases from the maximum value as the charging process continues, and when it decreases to 0.01C, the charging is considered to be terminated. (C is a method to express the nominal capacity of the battery against the current. For example, the capacity of the battery is 1000mAh, and 1C is the charging current 1000mA.)

Phase 4: charging termination - there are two typical charging termination methods: using the minimum charging current judgment or using a timer (or a combination of both). The minimum current method monitors the charging current at the constant voltage charging stage and terminates the charging when the charging current decreases to the range of 0.02c to 0.07c. The second method is timed from the beginning of the constant voltage charging stage, and the charging process is terminated after two hours of continuous charging.

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