guys that converted 8ight truggy to E

[kalbien]

Well I have two batteries for racing (3300mah 5s hyperion vx batteries) and I know I can run them 13minutes on track when needed)

charging them on 5c = no need for more than two, however I would rather get another 5000 zippy battery for bashing and won't charge hyperions as fast as possible.

about charger.. I would go with either two first here
http://media.hyperion.hk/dn/eos/
EOS 0720i will be my choice since I really never need to charge two batteries at once. but if you will be on track a lot for long time periods than maybe EOS 0615i DUO3 is your right choice.

make sure to get proper power supply for both of those