Originally Posted by Andrew32

Im not too sure on battery voltage selection as im not sure what your vehicles gearing is...but i do have an opinion
4s- Drivable, probably see mid 40s and good temps. People call it the "sweet spot"

5s - I think still drivable but you are gonna start stressing the drive line. Probably see 50's. Temps will be pushed but should be ok

6s - IS INSANE. would be a bit much. youll see 60's but you wont be able to do anything but go in a straight line. Start breaking weak parts, flip over all
the time. You need to watch temps

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As for battery Brands
Thunder power and flight power are considered top. They have been around a long time and are used by alot of the plane and heli guys (they been doing lipo for a long time)

Neu IMHO is the middle class battery. Wont break the bank but i see them as quality packs

Zippys are the cheapest batteries out there that i would trust. Little to no bad reviews on them.

Maxamps - over priced, over rated cells. And yes i do own a set of maxamps and they are starting to fail. Cant get 15 minutes out a 6000MAH battery.

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Charger

If your doing a 4s, get one 4s pack. One pack is better than 2 IMHO
same for 6s

I recommend the hyperion chargers. They are expensive but have built in balancers and I LOVE MINE

Check Out monster mikes page. Hes got the 3 popular hyperion chargers.
http://www.rc-monster.com/chargers.php
http://www.rc-monster.com/chargers.php