Which lipos for 9xl & 9920? Please help. 10c?15c?20c? - RC-Monster Forums

**Which lipos for 9xl & 9920? Please help. 10c?15c?20c? -** 02.22.2006, 01:51 PM

I have a Gmaxx I've been building and I'm in need of some advice. I have a 9920 esc with a 9xl motor. I have the single speed conversion on my maxx. My question is what can I run for Lipos? There are so many options. My biggest question is can I run 10c or 15c or do I need 20c batteries. I know I want to use 11.1v 3s 4000 mah packs but I don't know what the difference is between the 10c,15c or 20c versions of them. I know price is a big difference. Could someone please help. Thanks Guys.

Serum · 02.22.2006, 02:08 PM

i would take the 20C things, the XL motors can draw serious amps.

that 80A the 20C 4000mAh packs can deliver is just enough.

02.22.2006, 02:15 PM

I would go 6s for a 9xl

Serum · 02.22.2006, 02:30 PM

I assumed he ment 2 11.1V packs in serie.. :D (the way it's meant to be.. )

05:25 PM

So no less than 20c then correct? And I did mean I was going to use two 3s packs together sorry for the confusion? Any idea where to get the best deals on packs like these?

coolhandcountry · 02.22.2006, 06:37 PM

Quote:

Originally Posted by 4u2nv

So no less than 20c then correct? And I did mean I was going to use two 3s packs together sorry for the confusion?

I think this mean he is going to run 6s lipo rene. Which should work great on the 9xl motor.

Serum · 02.22.2006, 04:40 PM

I would use a minimum of 4S or 5S with this motor, otherwise the motor will take very much current from your packs and run not as efficient as you would like.

02.22.2006, 05:38 PM

Would these batteries be ok?

http://cgi.ebay.com/11-1V-4000Lithiu...QQcmdZViewItem

02.22.2006, 08:49 PM

Quote:

Originally Posted by 4u2nv

Would these batteries be ok?

http://cgi.ebay.com/11-1V-4000Lithiu...QQcmdZViewItem

OK, I'm going to clear up my question. I'm asking if I can use the batteries above with a 9920 esc and a 9xl motor. I will be using 2 - 11.1v 3s packs which should make 1 - 6s pack if I'm correct. So It should make a 11.1v 6s 4000mah 15c. Will this be good? What can I expect for speeds?

MetalMan · 02.22.2006, 10:17 PM

Quote:

Originally Posted by 4u2nv

Would these batteries be ok?

http://cgi.ebay.com/11-1V-4000Lithiu...QQcmdZViewItem

NO!! If you look at the auction, it says this pack has 18ga. wire... That's WAY too thin. Even if the wire was thicker, I would not trust these "new Chinese cells"... Go for something with a reputation, like Hyperion, Polyquest, or LiMn.

20C is unnecessary IMO. If you get a pack that can handle about 45amps continuous with 80amps burst then that should be adequate. A 6000mah 8C pack is rated to deliver 48amps continuously (for example), and would give better runtime than a 4000mah pack. Unless you are extremely worried about weight, I wouldn't even get a 20C pack. You pay a lot extra for them, and 10C-15C packs are plenty...

squeeforever · 02.22.2006, 05:41 PM

i think those would be fine.

Serum · 02.22.2006, 05:53 PM

Not in 3S with a 9XL, or are you planning on running 25-30 mph?

kmracer66 · 02.22.2006, 06:37 PM

nice new graphic there serum.

coolhandcountry · 02.22.2006, 08:54 PM

6s is 22.2volts. It should be fine with the batteries. I think I would go with the 20c rated batteries for a little extra insurance.

skellyo · 02.22.2006, 09:23 PM

You might want to check out these Hyperion 20C packs:

http://cheapbatterypacks.com/main.as...id=tp&sort=V20

They only have up to 3700mah, but at 20C, that should be more than adequate, especially since they're rated at 30C burst for 30sec.