RC-Monster Forums - View Single Post

pinolelst · 05:09 PM

I read somewhere that those cells really can't take much more than a 40 amp discharge....really can't remember where though...gonna go search...if I find it I'll post up..maybe in one of the rc airplane mags I have...:confused:

pinolelst

Ok found it in the 12-06 issue of quiet flyer..can't find the article online anywhere so I'll type in his conclusion here :

"What might this mean for most flyers? The cells should be good for applications that have current demand lower than 40 amps.At higher currents the useful capacity falls well below the 2300 mah spec and the cells get quite hot.While the cells might survive abuse at higher current it may not supply the voltage or capacity desired.So as with most all of the power systems being sold now it is necessary to be informed as to the limits and stay within them.Venture to the limts at your own risk !"/ quote

The article has graphs showing some pretty deep voltage depression at a 30 amp cont 50 amp pulse disharge cycle and a noted .010 ohms resistance vs a .006 ohms resistance for an old 3200 kokam lipo pack tested in the same way

as always YMMV

	(#7)
pinolelst RC-Monster Carbon Fiber Offline Posts: 145 Join Date: Jan 2007	01.15.2007, 04:27 PM I read somewhere that those cells really can't take much more than a 40 amp discharge....really can't remember where though...gonna go search...if I find it I'll post up..maybe in one of the rc airplane mags I have...:confused: pinolelst Ok found it in the 12-06 issue of quiet flyer..can't find the article online anywhere so I'll type in his conclusion here : "What might this mean for most flyers? The cells should be good for applications that have current demand lower than 40 amps.At higher currents the useful capacity falls well below the 2300 mah spec and the cells get quite hot.While the cells might survive abuse at higher current it may not supply the voltage or capacity desired.So as with most all of the power systems being sold now it is necessary to be informed as to the limits and stay within them.Venture to the limts at your own risk !"/ quote The article has graphs showing some pretty deep voltage depression at a 30 amp cont 50 amp pulse disharge cycle and a noted .010 ohms resistance vs a .006 ohms resistance for an old 3200 kokam lipo pack tested in the same way as always YMMV Last edited by pinolelst; 01.15.2007 at 05:09 PM.