This is what is typically used in a starter box -

http://www.amainhobbies.com/product_...Ah-Starter-Box


The only thing is you need to be aware of the voltage during its use so you don't wind up using it too much and overdischarging it. Some seem to be able to monitor lipo voltage well enough omn their own, some seem to need something that alerts them that the voltage is getting low liike a low voltage alarm like you see on eBay.