lipo and 9xl

[Gustav]

Thanks Serum.

Should i just use one of the Li-savers wired in where i have the ubec(controller wires) or would it be better to use one per pack somehow?The FMAs i was going to use have one per pack.
I guess in series the packs are acting like a single 8s pack so one would be OK?

[Serum]

Yes, one should be fine actually.

[squeeforever]

question, would a 8000mah 3s2p lipo pack that discharges 10C be ok with the 9xl? that would be 80 amps max and it says 40-48 amps continuous. would this be ok?

[coolhandcountry]

If it is a 10c continous it would be 80 amp continous. Which would be good.

[squeeforever]

but its 10c max. i think it would be ok but i dont really know. also, what would happen if it was exceeded? or would it just not deliever the power?

[MetalMan]

40amps cont. should be plenty for that motor. But 3s Lipo isn't enough voltage. You need 4s absolute minimum. I would consider 5s to be the minimum for usable purposes!

The lower C rate cells won't deliver the same voltage that the higher C rate ones will. Plain and simple, that is the main difference.

[squeeforever]

well i was gonna run 2 in series. also, what kind of run times should i expect?

-corey

EDIT: what happens then the motor draws more than the lipo batteries can deliever?

[MetalMan]

Others may be able to give you a better estimate on runtime than I could.

When a motor draws more from the battery is rated for, the voltage won't drop too low, unless it is for a long time. For RC car use, we will never see a Lipo drop low from a long burst, as long as the battery is being used properly. The worst thing that could happen would be that the LVC would kick in @ 3v/cell, which is why they are absolutely necessary.
Usually Lipos have a burst rating, and this is a burst rating for a period of time, usually 10secs.

[coolhandcountry]

with gp 3700 18 cells 25 -30 min on a 9xl so on 8000 mah I would say about and hour.

[Serum]

I would use a minimum of 4 cells as well. 5/6 is better. it is not about the mAh's only it's about the total available power.