Lithium batteries????????

[Mixmastabob4]

I'm planing on going Brushless with my micro and wanted to get lithiums, my question is how many cells should i run?????????

 

[HumboldtBlazer]

Li-Ion or Li-Poly?

 

[Mixmastabob4]

Li-Poly

 

[nitromadman]

what mini ?

 

[HumboldtBlazer]

2-3 cells is the norm depending on the application, at least from what I know.

 

[nitromadman]

yeah Hum's right no less than 2 and no more than 3

 

[irishXminit]

Li-poly questions for novak spy.

Ok guys i need to know few things for people with lithium battery experience....

only one i used was for my helicopter never used it for a car..

questions..

can the NOVAK SPY handle 2-3 cell lithium(poly) packs? ie (Lithium Kokam 2-3 Cell 1200mAH) because these are the same packs i used for my heli
and i can get 2 cells for $26 bucks and 3 cells for $40
and if so WHATS THE MAXIMUM mAH it can handle,

also with a brushless setup do any of you know what would be a better a 2 cell or a 3 cell lithium... (Lithium Kokam 2-3 Cell 1200mAH )

anyone help me out here.. I'm abot to cross over to lithium and it s abig decision ... because i need batteries
i know lithium will have longer run times i just need to know...

and i have a hobbico that can charge 2 batt packs at once including 2-3 cell lithiums let me know guys!

 

[Çh®i§tiªñ]

I thought it was Mamba that was releasing the whole kit, for LiPoly, if not, its Hacker. Check them out.

I'm still skeptical as those LiPoly's arent as stable as Id like to see. And when they go, whatever they are near go up in flames. The flight field has seen 2 go down this year already.

I think I'm just a whimp like that.

 

[irishXminit]

well i used one for my heli.. never had a prob.. but i was gonna get the mamba setup with esc... was just thinkin in the mean time.. etc.

 

[HumboldtBlazer]

I thought it was Mamba that was releasing the whole kit, for LiPoly, if not, its Hacker. Check them out.

I'm still skeptical as those LiPoly's arent as stable as Id like to see. And when they go, whatever they are near go up in flames. The flight field has seen 2 go down this year already.

I think I'm just a whimp like that.

As long as they are charged right they are no problem. Not very scary at all.

Irish:

I wouldn't even use 2 Li-Poly cells on your SPY as mine fried (check my 3racing chassis thread). I use the IPD R-18 which can handle 10 cells (Ni-MH) and 540 motors. With the Mamba (top 2 motors) I would run 3 cells but never over that. I run 2 cells fine on my IPD R-18 and it is just fine. I run Blind's Rabid Chichuahua and also I have a beast and 2 stock speed 300's and I play with all of them in my Mini-T

 

[lykan]

I don;t think it's the Mah you have to worry about. It's voltage, and motor draw (amps).

For Example..2 Li-poly's making a total of 7.2 volts should be no problem at all for a normal esc. Under normal conditions

The motor draws a certain amount of amps. A stock motor at full throttle won't pull enough amps to hurt your ESC. The stock motor will likely burn up before you strain your esc.

The lower the turn on the motor, the more amps it will pull through the esc.

What you need to check is max AMP rating for your ESC(burst/peak, and continuos). Then you need to look at the motor you have or are going to use, and see what kind of amperage it will draw. Whatch how the esc's are rated. Burst rates are only meant to handle that load for a certain amount of time, continuos means it will take that amp load all day long and be fine.

 

[HumboldtBlazer]

Problem with the Li-Poly is they are a little higher @ 7.4V but the real issue is the dischargge rate is so high and so constant and this is why this battery preforms so much better than a Ni-MH. A higher discharge rate means more juice going through the ESC. So voltage is voltage but the discharge rates a widley different when comparing Ni-MH and Li-Poly.

http://www.legallou.com/Technique/Accu/lipo/Comparatif/decharge/lipolyNimh.gif

Here is a good basic battery information that helped me. http://www.centurion.com/home/pdf/wp_battery_fundamentals.pdf