What voltage does 3.7v lithium battery should be charged?

Generally, 3.7v lithium battery requires "protection plate" with overcharge and over discharge. If the battery does not have a protection plate, it can only use about 4.2v charging pressure, because the ideal full charging pressure of lithium battery is 4.2v, and the battery may be damaged if the voltage exceeds 4.2v. In this way, the battery condition shall be monitored at the same time.

You can use 5v with the protection board (4.8 to 5.2 can be used), computer USB5v or mobile phone 5v charger can be used.

3.7v battery, charging cut-off voltage 4.2v, discharge cut-off voltage 3.0v. Therefore, when the open circuit voltage of the battery is lower than 3.6v, it should be able to charge. It is better to use the 4.2v constant voltage charging mode, so you do not need to pay attention to the charging time. It is easy to overcharge with 5V.

1. Floating charge. Charge while working online. This method is often used in backup power supply situations. Less than 12 volts cannot be charged, too high to affect the circuit work. Therefore, when floating charging works, the voltage is 13.8 volts.

2. Cyclic charging. Fully charge the battery to restore its capacity. When fully charged, the charger should be continuously turned on and measured, generally at about 14.5 volts and up to 14.9 volts. After disconnecting the charger for 24 hours, it is generally around 13v to 13.5 v. About 12.8 to 12.9 volts a week later. Specific voltage values of different batteries vary.

The normal lithium battery monomer is 3.7v, the full voltage is 4.2v, after the series of nominal voltage is only 7.4v,11.1v,14.8v... The corresponding full voltage (i.e., no-load output voltage of the charger) is 8.4v,12.6v,16.8v... It can't be a 12v integer, just like the lead-acid battery is 2v apart, full is 2.4v, corresponding only to the nominal 6v,12v,24v... Full voltage (also charger output voltage) is 7.2v,14.4v,28.8v respectively... What kind of lithium battery are you?

The output of the charger is usually 5 v, 4.9 v is also a not standard, do you want to use the direct the rechargeable battery charger, can't be sure, but as long as after a mobile phone or charger, so inside it there is a control circuit, will limit in lithium battery within the allowable range, unless the damage of circuit, this don't have to worry about

The normal lithium battery monomer is 3.7v, the full voltage is 4.2v, after the series of nominal voltage is only 7.4v,11.1v,14.8v... The corresponding full voltage (i.e., no-load output voltage of the charger) is 8.4v,12.6v,16.8v... It can't be a 12v integer, just like the lead-acid battery is 2v apart, full is 2.4v, corresponding only to the nominal 6v,12v,24v... Full voltage (also charger output voltage) is 7.2v,14.4v,28.8v respectively... What kind of lithium battery are you?

18500 battery is widely used in cylindrical lithium battery, can be used in electronic cigarettes, toys, security, vehicle and other electronic fields.

Cell technology mature enterprises have Biko, Tiansheng, China Yuebao and other manufacturers, stable performance. The definition law of its model is as follows: for example, type 18650 refers to the battery with a diameter of 18mm, a length of 65mm, an 18500 battery with a diameter of 18mm and a length of 50mm and a cylindrical shape.

Voltage: 3.6v (conventional general-purpose battery, used for the maximum 1C discharge of low-power electrical equipment of electronic products. Discharge condition can be changed according to the situation)

3.2v (power battery can be customized according to the situation)

Charging parameter: 4.2v

The minimum discharge termination voltage is generally 2.75v and the maximum charging termination voltage is 4.20v (Sanyo, Samsung, Panasonic and Tiansheng TS/ the latest large-capacity 18500 charging termination voltage is 4.35v).

Capacity: 3.6v lithium cobalt carbonate now the technology has reached 1900AMH (according to Tiansheng Weiye technology department)

Diameter: 18 + / - 0.2

Battery specification drawing

Battery specification drawing

The minimum discharge termination voltage is generally 2.75v

Type 18650 lithium battery

Maximum charging termination voltage: 4.20v (the latest large-capacity 18650 from Sanyo, Samsung and Panasonic has a charging termination voltage of 4.35v)

Height: 50 + / - 0.3

Common combination parameter editing

Combination mode: icr 18500-4s2p

Nominal voltage: 14.8v

Output voltage range: 10~16.8v

Nominal capacity: 3000mAh

Standard continuous discharge current: 0.2c

Maximum continuous discharge current: 1C

Working temperature: charging: 0 ~ 45 ℃

Discharge: - 20 ~ 60 ℃

Product size: MAX35*54*83mm

Finished product resistance: 250 m or less Ω

Lead wire model: national standard ul1007/18 #, the length of which is 150mm

Protection parameters:

Overcharge protection voltage / 4.25 + / - 0.025V per string

The over-discharge protection voltage is 2.5 + + 0.08V

Overcurrent value: 4~8A

Charger selection edit

Standard charging: the battery is firstly charged with A constant current of 0.5a (1.5a) to 4.2v, and then with A constant voltage of 4.2v to 0.01C5A when the charging current gradually decreases, and the charging time is about 3 hours. Within 0 ~ 45 ℃ rechargeable batteries should be no permanent damage.

Standard discharge: 18500 battery charged in 20 + / - 5 ℃ environment temperature shelved after 30 minutes, with 0.2 C5A electric constant exile to 6.0 V, discharge time is about 5 hours. Therefore, it is suitable to choose 4.2v /1A lithium battery charger.