How to connect Li-ion batteries having Multiple Ah ratings ???

[ROCKET SCIENTIST]

I have 3 two month used old mobile phone batteries. All of them are 3.7 volt but their Ah ratings are different. 1350mAh, 1150mAh and 1100mAh.... I wanna use them for power supply in a robotic car to achieve minimum of 10 or 11 volts... But I don't know what is the best way to connect them together and how to make a charger circuit for them? Will it be good to charge them together or separately? pls suggest a suitable circuit.

Regards,

rockeT/Scientist.

 

[Tahmid]

When using the batteries together, use them in series.


https://www.engineersedge.com/battery/battery_series_parallel_connections.htm

Since they have different current ratings, don't charge them together. Charge them separately.

Hope this helps.
Tahmid.

 

[ROCKET SCIENTIST]

Thanx to both of you. I have another question. What is the minimum safe discharging voltage for Li-ion batteries?