I saw this on an airplane site and thought I would post it here. The info is for 3s1p packs, but I would think it would be the same for 2s packs.

Kokam pack
http://www.slowflyer.ch/downloads/tn06007.pdf

other brands
http://www.slowflyer.ch/000000972c0e2a41b/0000009794081290e/index.php

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXRWF7&P=SM