Mixed mAh lipos OK?

[Tony]

Hi guys.
Will two lipo packs with diff. mAh work in series ?

7.4v 3300mAh 25C and 7.4v 4000mAh 25C

[Doby]

No.

[ED66677]

NO...
and YES but...
having two different capacity in serie will cause some problem, the smaller capacity pack will be overdischarged before the ESC cut-off acts, this will kill the pack!!!
the rule is to always have same capacity pack, no matter if they are connected in serie or parallel!

[bustitup]

NO

it might work for a bit but something is going to fail

[Doby]

No, ,,,,,,,What Ed said!

The lower capacity pack will not survive for long.

[Tony]

I'll just have to buy another 3300mAh lipo to run with the pack i have now. My other TP pack wouldn't charge correctly due to "wrong polarity, and wrong voltage" .... Anyways, thanks for the info guys. e"

[Flying Scotsman]

Just , a note you can run different Mah packs in PARALLEL. There was a discussion on this very subject on another forum and Professor Bill-SOCAL weighed in and stated Ohms law.

Douggie

[Himalaya]

That is correct, run different mAh packs in parrallel has no issue, as long as the S numbers are same, and the discharge capability(C rating) better be close. I run 2600mAh and 2200mAh 6S packs in parallel without a single problem.

[Tony]

That is correct, run different mAh packs in parrallel has no issue, as long as the S numbers are same, and the discharge capability(C rating) better be close. I run 2600mAh and 2200mAh 6S packs in parallel without a single problem.

So, parallel = more run times and less speed
series = more speed and less run times
correct?

[Flying Scotsman]

So, parallel = more run times and less speed
series = more speed and less run times
correct?

It comes down to volts and amps

2 2S1P 2500 mah 20C in parallel= 7.4v 5000 mah

2 2S1P 2500 mah 20 C in series = 14.8v 2500 mah

Douggie

[Ocean Racer]

Dougie maybe Im missing something but did you forget to change something on your chart?

[bwells]

I'll bite! The C rating would change on the parallel example, yeah?

[Himalaya]

Douggie is right, C is a constant showing how well the pack handles high current, never changes unless it's getting old.

Let me continue Douggie's equations:

2 2S1P 2500 mah 20C in parallel= 7.4v 5000 mah 20C, good for 100A*7V =1400W

2 2S1P 2500 mah 20 C in series = 14.8v 2500 mah 20C, good for 50A*14V = 1400W

make sense ?

[Tony]

Douggie is right, C is a constant showing how well the pack handles high current, never changes unless it's getting old.

Let me continue Douggie's equations:

2 2S1P 2500 mah 20C in parallel= 7.4v 5000 mah 20C, good for 100A*7V =1400W

2 2S1P 2500 mah 20 C in series = 14.8v 2500 mah 20C, good for 50A*14V = 1400W

make sense ?

2 2s1p 7.4v 5000mAh 20C in series = 14.8v 5000mAh 20C, good for 100A*
Is 100A* good for a 32" cat running a 9xl, ETTI 125 esc, x642 prop?