mamba on 4 cells

hey guys. i have a rustler and im running the sidewinder in it. and i have a 2 cell lipo and 2x7cell nimh. and i have 2 extra nimh cells just sitting around. i was going to put them on one of the 7 cells to make 9 cells for a total of 10.8 volts. but i was thinking since the motor (5700) can handle 12cells nimh and thats a total of 14.4 volts. would it be able to handle a 4 cell lipo. with a bec just in case lol.

just wanted to know. thanks.

if it can i was just going to get one more 2 cell since they are cheap at my job and put them together and make a 4 cell. and see what it can do.

[lincpimp]

I would not run the 5700 for extened periods of time with tall gearing, but I am sure it will be fine with decent gearing. Most feel that with anything over 6 cell nimh or 2s lipo the mm will benifit from the internal bec disadled and a external one employed.

well yah i was going to run the external bec. but was just wondering if it could handle a 4 cell. most likely i would not run it for that long. but just a few mins. just to show it off . reason why i would buy a second 2 cell. that way in the long run i can have 2 batterys.

oh btw my gearing right now is 86/20 and running great.

I'm not sure I would push a sidewinder to 4s. You can give it a shot, carefully, and let us know if it works. The motor would be ok for short runs with cool down time in between, but I'm not sure on the sidewinder.

J.

ok i might try it later on. we shall see what happeneds. just got to get a bec frist. we are out of stock at it at work right now.

[SpEEdyBL]

esc can handle 4s with external bec, the motor can't. 12cells nimh is closer to 3s lipo performance wise and 4s is a totally different story.

but i thought that 12 cells was 14.4 volts and a 4 cell is 14.8 volts.

the motor @ 4s will be turning 84k and you will fry that motor , be sure to have a video camera close by when you do this..... :-0

[sleebus.jones]

4S is no problem, but you will need to disable the internal BEC for sure.

I run 5S A123 with no problems.

[SpEEdyBL]

Originally Posted by drkros3

but i thought that 12 cells was 14.4 volts and a 4 cell is 14.8 volts.

12 Ni-mh cells will drop to about 12 volts under a 100 amp load, but the right 4s pack will stay at about 14 volts under the same load. Lipo is also lighter so you will need less power to get the car moving, thus the motor will spin faster.

Originally Posted by SpEEdyBL

12 Ni-mh cells will drop to about 12 volts under a 100 amp load, but the right 4s pack will stay at about 14 volts under the same load. Lipo is also lighter so you will need less power to get the car moving, thus the motor will spin faster.

now i get it. thanks for the info.