Hi.

I don't know if this is the right forum to post this question. So, if I'm wrong, excuse me.

I am trying to repair a tablet that is fully operational but the usb port is broken, so I cannot charge its battery. I have ruled out the possibility of replacing the usb port because of the complexity of welding such small tracks. So I am thinking in charge the battery directly, because it's easy to connect a charger to the battery cables. The battery inside is a LiPo battery 6500mAh. I have found the specifications on this link: https://www.aliexpress.com/item/26130147-3-7V-6500MAH-lithium-polymer-battery-backup-power-supply-3-7V-Tablet-battery-Rechargeable-batteries/32835152639.html

Specifications:
1,Nominal voltage:3.7V;
2,Standard charge and discharge at 1C

Feature:
3.7v lithium battery pack for psp battery
Charge current: standard 0.2 C5A and maximum 1C5A
Charge cut-off voltage: 4.20 0.03V
Standard discharge current: 0.2C5A
Maximum discharge current: 2.0C5A
Discharge cut-off voltage: 2.75V

I don't understand what is the meaning of C5A.
So I would like to know, what specifications should have a charger module to connect directly to the battery? I am worried about risk of overheating and explosion.

I have seen several charger modules but i am not sure if they can charge this battery without problems.

Module 1
Features:
Battery over discharge protection voltage: 2.5V
Battery over-current protection current: 3A
Support charging&discharging at the same time

Parameter:
The input voltage: 5V
Maximum charging current: 1000 mA
Charge cut-off voltage: 4.2 V + / - 1%

Module 2
Description:
1.Module type: Lipo Battery Charging Board
2.Charge mode: Linear charging
3.Charge Current: 1A
4.Charge precision: 1.5 %
5.Input voltage: 4.5V ~ 5.5V
6.Full charged voltage: 4.2 V
7.Led indicator: Red is charging, Blue is full charged

Module 3
Features:
2 in 1 charge and Discharger(boost) modules
Charge voltage : DC 4.6V-8V(Recommend DC 5V)
Charging current : 0-1A
Full charge voltage : 4.2V+-2%.
Led indicator : "OK" LED is fully charged OR battery failure status indicator;
"CR" LED is charge status indicator

Discharge current : 0-2A;
Discharge quiescent current : 450uA
Discharge conversion efficiency : 78%-90%

Output current : 0-1.2A（5V）;
This module without lithium battery over-discharge protection.
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Can these charge modules work fine for that battery? Should I look for different charger modules?


Regards.
akinet

 

C5A means a Constant Current for 5Hours at the maximum current, so 0.2C5A is 200mA @5Hrs, 1C5A is 1Amp @ 5Hrs, all the chargers you posted have a maximum charge at 1Amp, just get the one you can afford.

 

Thank you for your answer!

I was worried about the possibility of overheating or explosion if the charger module was not appropriate. If I charge the battery for more than 5 hours, will there be any problem?
I suppose option #3 with charge an discharge function will be better. Or is it unnecessary?

Regards.

 

The deadicated chargers will have a cut off after 5 hours, providing safety protection.

Discharge function will give you a full charge from total minimum voltage .