And just to expand, batteries have two (or three) important bits.
The capacity, mAh. 5000 mAh (milli Amp hours) will run a TC, with an 8.5T motor for around 20 minutes (well, thats about what i get!) until you hit the Low Voltage Cutoff (this is to protect the battery, going below 3.2/3.4v per cell doesn't do them any favours) The LVC is usually integral to the ESC and can quite often be programmed.
The continuous current rating:
Usually the lower of the two "C" ratings e.g. 50C. If you multiply this by the Ah rating, you'll get the continuous current the battery can produce, so a 50C 5000mAh battery can give out 250 amps, in theory.
The other rating is the instantaneous or burst rating e.g. 100C, this means your 5000mAh battery can give out 500A for a very short time.
The C ratings are a bit crap to be honest, as most manufacturers lie/make up the numbers, or measure them in different ways, but any major manufacturers batteries *should* be up to the job (Gens Ace and Turnigy Nanotech are both cheap and good, which is unusual!)
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