RC-Monster Forums - View Single Post

_paralyzed_ · 06.30.2012, 02:09 AM

lipos are 3.7v/cell nominal, 4.2v/cell fully charged, so a 3s pack is 11.1v at rest and 12.6v fully charged

A123 as you know has a nominal voltage of 3.3v/cell, and 3.6v/cell fully charged, so a 4s pack is 13.2v at rest and 14.4v fully charged.

The esc may handle the additional voltage, in my opinion it's not worth the risk. The motor is already at it's limits on 3s lipo, and any additional voltage (more rpm) will probably kill it.

I would not run 4s a123 on a vxl system. Run 3s and just gear up for the same overall speed.

	(#2)
_paralyzed_ working on a brushless for my wheelchair..... Offline Posts: 4,890 Join Date: Mar 2007 Location: minnesnowta	06.30.2012, 02:09 AM lipos are 3.7v/cell nominal, 4.2v/cell fully charged, so a 3s pack is 11.1v at rest and 12.6v fully charged A123 as you know has a nominal voltage of 3.3v/cell, and 3.6v/cell fully charged, so a 4s pack is 13.2v at rest and 14.4v fully charged. The esc may handle the additional voltage, in my opinion it's not worth the risk. The motor is already at it's limits on 3s lipo, and any additional voltage (more rpm) will probably kill it. I would not run 4s a123 on a vxl system. Run 3s and just gear up for the same overall speed. _______________________________________ It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.