I'm just now getting into this. I just bought me a Traxxas slash 4x4 brushless vxl that comes with a 2s lipo 5800mah 7.4V battery pack and the ez peak Id quick charger. I'm wanting to get another battery (probably another one of higher mah and V?) Not sure what brand would be best bang for my buck? Also I'd like to get the cooling fans for both my ESC and motor. Would this be necessary if i were to be running (2) 2s battery back to back? Or would the cooling fans be more for a 3s lipo battery? Also, what CC and V should I buy my batteries in?

I do not suggest going with a 3S pack if you are new to the hobby. 3S will make it crazy fast and possibly even uncontrollable for you. I say its best to get a good charger and 2S LiPO then a 3S LiPO.

Charger; http://www.atomikrc.com/collections/...attery-charger

2S LiPO; http://www.atomikrc.com/collections/...-with-uni-plug

Thanks for the reply! Yeah I was going to wait for a 3s lol. But as for the mah, how come everywhere I've seen, most people suggest the 5000mah. Wouldn't it be better to get idk maybe a 8000mah? What would the difference be between 7.4V and 11.1V and difference between the 25CC compared to a 40CC?

For lighter buggies and 2wd 1/10 trucks, a 30C discharge rate (minimum) for LiPo battery packs is a good rate to start with. Now, jumping up to 1/10 scale 4wd heavier platforms, I would suggest using batteries with at least a 40C discharge rate minimum.

The LiPo battery discharge rate basically indicates how fast a RC LiPo battery can be discharged safely. I would say you can't go wrong with a C rating that is too high, but then you have a money issue sometimes. The higher the C rating ... more expensive the pack will be.

There are a lot of places to find some answers. Here is just one .

Another good source for some info...RC Resources for the beginner [Read this first]

The battery that comes with the slash 4x4 I bought is rated 25cc. So if I go buy another battery, I should get at least above 30cc? What brand you recommend?

Look at the links I posted above.

I love RC Universe. I don't do RC cars, but thanks for the good info on LiPo batteries, which I do use. there is so much to be learned about the hobby by reading RCU regularly.

Absolutely! What are you into? Planes?