HELP for a battery please HELP

[manu.le.ouf]

Hello everyone, I have a screen that not run under 12V, so I have talk with hailrazer on the forum and he told me to used a 14.8V for a good playtime because if I use 12v the battery shut down when it rest 20% life left...

So I finally found a battery not too high (price), can someone expert in voltage told me if this battery is good for me please And can you tell me how long I can play with this ?

http://www.batteryspace.com/Li-ion-1865 ... -3.36.aspx

And playtime for this one
http://www.batteryspace.com/custom-cyli ... -9-36.aspx

Thank you.

 

[Prog]

#1 doesn't have that great of a capacity. #2 is expensive and pretty big.