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The charging voltage of 3.7V lithium battery

3.7V lithium battery

The 3.7v lithium battery is a lithium battery with a nominal voltage of 3.7v and a full-charge voltage of 4.2v. Its capacity ranges from several hundred to several thousand mAh. It is generally used in various instruments and meters, testing instruments, medical instruments, POS machines, notebook computers, and other products.

About the capacity of 3.7V lithium battery capacity, the larger the volume of a single lithium battery, the greater the capacity, or we can say that the more the number of lithium batteries in parallel, the greater the capacity.

Generally, a 3.7v lithium battery needs a “protection board” for over-charging&discharging. The battery without a protection board can only be charged with 4.2V voltage, because the ideal full charge voltage of a lithium battery is 4.2v, once the voltage exceeds 4.2v, the battery may be damaged. Charging in this way requires someone to monitor the condition of the battery at all times.

On the contrary, the battery with a protection board can be charged with 5V (range from 4.8V to 5.2V). As we know, in most cases, a 5V charger can be used for USB of computers and mobile phones.

The charging cut-off voltage of 3.7V battery is 4.2V and the discharge cut-off voltage is 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 don’t need to pay attention to the charging time. If 5V charging is used, overcharging is easy to happen.

1. Floating Charge

Floating charging means that the device is being charged while being used. This method is often used in standby power supply situations. When the voltage is lower than 12V, the equipment can not be charged. At the same time, if the voltage is too high, the circuit will be affected. Therefore, the voltage of the floating charge is 13.8V.

2. Cycle Charging

Cycle charging refers to the full charge to restore the capacity of the battery. When the battery is fully charged, it is measured without disconnecting the charger. At this time, the voltage is generally around 14.5V, and the maximum voltage will not exceed 14.9V. After disconnecting the charger for 24 hours, the voltage will generally be around 13V to 13.5V. After one week, it will be dropped to 12.8v ~ 12.9v. The specific voltage value of different batteries is different.

The nominal voltage of lithium battery is 3.7V and the charging voltage is 4.2V. The nominal voltage of batteries in series is only 7.4v, 11.1v, 14.8V…  which corresponds to the charging voltage (i.e. charger no-load output voltage) of 8.4v, 12.6V, 16.8v…It is impossible to be a multiple of 12V.

The output voltage of the charger is generally 5V, even 4.9v does not meet the standard. If you use a 4.9v charger to directly charge the pool, it is definitely not allowed. However, there will be a control circuit inside the mobile phone or the seat charger. Unless the circuit goes wrong, it will limit the charging voltage to be within the allowable range, so there is no need to worry about this.

3.3. Grepow 3.7V lithium battery List

Manufacturer Voltage Capacity Shaped Type Model
Grepow 3.7V 220mAh Rectangle Lipo Battery GRP4812050
Grepow 3.7V 120mAh Irregular Hexagon Lipo Battery GRP4022020
Grepow 3.7V 22mAh ultra-thin Lipo Battery GRP0422055
Grepow 3.7V 90mAh Curve Lipo Battery GRP3113031
Grepow 3.7V 225mAh Curve Lipo Battery GRP4017040
Grepow 3.7V 200mAh Rectangle Lipo Battery GRP5811047
Grepow 3.7V 220mAh Rectangle Lipo Battery GRP6011047
Grepow 3.7V 66mAh Button-Cell Lipo Battery GRP1254
Grepow 3.7V 250mAh Rectangle Lipo Battery GRP5212050
Grepow 3.7V 40mAh Curve Lipo Battery GRP2508030
Grepow 3.7V 450mAh Rectangle Lipo Battery GRP6824037
Grepow 3.7V 85mAh Curve Lipo Battery GRP3512029
Grepow 3.7V 22mAh Rectangle Lipo Battery GRP2010021
Grepow 3.7V 37mAh Rectangle Lipo Battery GRP3013020
Grepow 3.7V 100mAh Round Lipo Battery GRP5516015
Grepow 3.7V 125mAh Round Lipo Battery GRP5521020
Grepow 3.7V 135mAh Round Lipo Battery GRP2530027
Grepow 3.7V 1500mAh Round Lipo Battery GRP7550040
Grepow 3.7V 170mAh Round Lipo Battery GRP3030027
Grepow 3.7V 210mAh Round Lipo Battery GRP2537036
Grepow 3.7V 225mAh Round Lipo Battery GRP3630027
Grepow 3.7V 835mAh Irregular Round Lipo Battery GRP7042030
Grepow 3.7V 300mAh Round Lipo Battery GRP5030027

If you would like to know more about batteries please contact us at info@grepow.com

Website: http://www.grepow.com

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