What's your favorite battery setup?

broke ess supra · #1 03-27-2005, 08:27 PM

I started this thread because i wanted to hear other's opinions on the pros and cons of different battery setups.

Personally i have used 4,5,6,7, and 8 cell battery setups. I haven't tried lithium ions yet so some input would definately be appreciated.

ok this is what i think(using tight turns,AWD,soft slicks,Medium suspension all around, s/b magnets, ball-bearing can, ~37k motor)
-4 cells is good when it comes to a smooth surface in handling, on pavement it is incredibly unstable. top speed and accell are bad
-5 cell with battery behind back bumper is faster and the handling might be a little worse
-6 cell with batteries behind back bumper-accellaration is best with torque and so is top speed. Handling is shoddy, front end really loosens with increased top speed and flips over sometimes.
-7 cell has so much torque that the car can't really put it to the ground, top speed i believe suffers a bit and handling is suprisingly pleasent. the added weight really added some stability on concrete. The car when on full throttle and turn will sometimes drift a bit into a turn not lossing a lot of speed when taking high speed turns.
-8 cell handling is a little bit like 7 cell setup but more drifty in fact tires can't put down the torque to the ground. too much tire spin on turns. I really didn't take the time to change the setup to make the handling better but i believe its just too heavy. CHECK THIS OUT so much darn torque that it ripped my crazy glued tires right off the rims! But i see hardly any top speed and accell is terrible.

In conclusion-6 cell for accel and top speed and 7 cell for handling

rssjib · #2 03-31-2005, 11:41 PM

Dude - the Li-Ions rock...think of the weight savings alone.

And, where the hell did you fit all of those batteries?????

The Li-Ions do have good power and are hard to describe until you run them...they absolutely kick azz...

gorbasho · #3 04-02-2005, 12:13 AM

seriously. where did u find room to cram 4 more cells in?

rssjib · #4 04-02-2005, 12:54 AM

If he had 8 cells, he didn't have a body on it...it was just for the hell of it...

broke ess supra · #5 04-02-2005, 12:41 PM

rssjib i did have the body and
-first off i had the roomiest body the toyota supra
-I used two-2 cell packs from a junk xmod that i had laying around
-I mounted one pack behind the back bumper and another right on top of the chassis under the body(velcro helps, no heat sink guys).
-i used one of those yellow bushings to raise the body a few mms on the back body clip
tada-8 cell...oh i also had fets so the motor I was using wouldn't burn da stock ones

i ditched that setup though...like i said before it is too heavy and too much torque for the grip of the tires
I also eventually zapped the antenna with the mess of wires and when i took out the pcb some of the leads were like burnt and hanging off of the board i guess from the increased votage...the funny thing is that everything worked on the board! even with little burnt pieces hanging off.

gorbasho · #6 04-02-2005, 05:23 PM

whats the most number of cells you can run with stock FETs?

broke ess supra · #7 04-02-2005, 05:56 PM

-In general i wouldn't recommend sticking 7-8 cells to your xmod because the fets might not burn with a low current draw motor but the board might fry because of the high voltage...my xmod board didn't fry enough to stop operation but i guess it depends on your luck of the quality of the board you get.
-To answer your question It really depends on the motor...a stage 1 doesn't draw much current so 7-8 cells would probably run good...a stage 2 would run 6 cells safely...with four cells i run a 40T armature with spinbrush mags and bb can on stock fets
-the stock fets can handle somewhere in the vicinity of 2.5-3 amps i think...with ohms law you can find out how much current a motor draws if you have the resitance and voltage...so if you have a custom motor be careful...i wouldn't run a hybrid motor on 6 cells for more than 5 minutes and wouldn't even run it with 7-8 cells just to be safe.

gorbasho · #8 04-02-2005, 06:12 PM

look!

broke ess supra · #9 04-03-2005, 04:27 PM

man do i wish i had the money to buy a lithium ion upgrade...till then i'll stick to my cost efficient six cell...oh well