These are pretty close:
Cell Specifications
Chemistry Lipo
Capacity 5000mah
Voltage 5S-(18.5volts)
Length 6.38in 162mm
Width 1.93in 49mm
Thickness 1.93in 49mm
Weight 22.41oz 635gm
Product Description
18.5 volt (5s) Lipo pack. Rated at 20C continuous 30C Burst rate (under 30 seconds)
http://cheapbatterypacks.com/main.as...rt=P20#prodtop