Lipo cell capacity in series

by Z. Ali
(Dubai)

If Two cells of 3.7v are connected in series, but having different capacities (3700ma AND 4400ma)the would there be any problem.

Thanks

A reply to the above would be appreciated.

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Lipo cell capacity in series

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wouldn't recommend it
by: Matt

Hi Ali,

I wouldn't recommend putting a 3700mah and 4400mah lipo cells in series.

As soon as the motor starts drawing current the cells will immediately become out of balance. The voltage of the 3700mah will drop faster than the 4400mah battery.

Let's say your low voltage cut-off is set at 6volts. When the voltage of the combined cells in series reaches 6volts, the voltage of the 3700mah cell will be below 3 volts and the voltage of the 4400mah will be above 3 volts.

This will damage the 3700mah cell.

If you connected balancing leads of the 3700mah to some sort of low voltage audible alarm

to make sure that you do not go below 3 volts then it may be OK.

But in general, I wouldn't recommend mixing two different capacities packs.

I hope this helps,

Matt

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Submitted by: Matt

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Hi Ali, I wouldn't recommend putting a 3700mah and 4400mah lipo cells in series. As soon as the motor starts drawing current the cells will immediately become out of balance. The voltage of the 3700mah will drop faster than the 4400mah battery. Let's say your low voltage cut-off is set at 6volts. When the voltage of the combined cells in series reaches 6volts, the voltage of the 3700mah cell will be below 3 volts and the voltage of the 4400mah will be above 3 volts. This will damage the 3700mah cell. If you connected balancing leads of the 3700mah to some sort of <a rel="nofollow" target="_new" href="http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=9&pub=5574658768&toolid=10001&campid=5336359786&customid=lip+alarm+c2+link&icep_uq=lipo+alarm&icep_sellerId=&icep_ex_kw=&icep_sortBy=12&icep_catId=&icep_minPrice=&icep_maxPrice=&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg">low voltage audible alarm</a><img style="text-decoration:none;border:0;padding:0;margin:0;" src="http://rover.ebay.com/roverimp/1/711-53200-19255-0/1?ff3=9&pub=5574658768&toolid=10001&campid=5336359786&customid=lip+alarm+c2+link&uq=lipo+alarm&mpt=[CACHEBUSTER]"> to make sure that you do not go below 3 volts then it may be OK. But in general, I wouldn't recommend mixing two different capacities packs. I hope this helps, Matt

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