Would this work?

yeah i guess so. I thought it might hurt the older cells or something? I dont know, i'll just try it when i get my brushless.

[Dafni]

Originally posted by JOHNNYMAXXIMA
The gearing that I am running now is 66/19, and was thinking of going to a 21t pinion. Do you think I should stick with the 19 if I ad the extra cells?
Thanks.

Increasing voltage and gearing at the same time is not a good idea. Check the temps, you might even want to gear down. If I remember correctly, I ran some 9L's on 14 cells with a 16/66.

Originally posted by mack
If I were you I would just try it.:D
What's the worse that good happen.

On 16 cells? The worst? Probably a demagnetized magnet from too much heat.

[JOHNNYMAXXIMA]

Thanks Daf.
Where is a good place for me to buy 2 cells from?

[RCcarnut]

yeah i guess so. I thought it might hurt the older cells or something? I dont know, i'll just try it when i get my brushless.

The thing I would worry about is the new cells. If they don't come fully charged(which most don't) and you add one cell to an 7 cell pack(which is full charged), then peak the new pack. It will charge very fast and the new cell won't get full voltage, then you used them and if you run down the new cell too much you can damage it. At least this is what I thought could happen. Maybe I am wrong:C:

What I do when I add new cells to an old pack is make sure all the cells I put together are full peaked. If I buy new cells I charge them first and the battery they are going on also. The ideal thing would be to just test the voltage on each cell and make sure they are all charged up the same.

Mike has single GP 3300s for sale. They aren't green and yellow in the pic but that doesn't matter much as long as it says GP 3300. You could probably get a 6 pack of the green and yellow off ebay or something.

[JOHNNYMAXXIMA]

How about these ones that Mike sells. Would they work?
Thanks.

[Sylvester]

Yes, those should work fine, but ask some of those electric wizzes just to be sure. (mike, serum, dafni and metalman, sorry if i missed you;))

[JOHNNYMAXXIMA]

Thanks, anyone else have any input?

[Dafni]

If you really want to add 2 cells, those red GP 3300mAh from Mike should work well.
Just make sure the cells have the same state as your pack when you solder them together (either fully charged or discharged).

I would suggest checking the temps on your pack after you charge and use them. If a single cell get's exceptionally hot, you have a problem.

DAF

[Jasper]

I started with two, 6 cell GP3300 peak powerflo P/M packs. After a few runs I want more power and I put at each pack one cell. I discharged the 6 cell pack by driving and after that I put the pack on an robitronic discharge equilizer to makte them the same voltage. The extra cell was allready discharged. I soldered it together and charged it at 3A with 8MV/cell. All the cells were after charging the same temperature. The output of power was also higher.

[JOHNNYMAXXIMA]

Cool, thanks.
I am ordering the extra cells today.