[jhautz]

2 3s packs in parallel have the same amount of energy as 2 3s packs in series or one 6s pack of double the capacity. Its all going to weigh the same. so what are you gaining by running the lower voltage. You will get better runtimes and lower temps by going with double the voltage and half the capacity as long as you choose an appropriate motor to go with the higher voltage.

Ive been racing my 1/8 buggy and have tried alto of different motors and voltages. 3s,4s 5s 6s etc... and easily a couple dozen different motors. So far the best combo for staying cool and giving long run times on the track without being totally overkill and undrivably powerful has been a 5s setup on either a 1512/3d or 1512/1.5y. Both have been great motors for 5s racing.

I thought you said you were looking to save weight??? Saving weight and trying to run for 30 minutes without a pack swap are totally contradictory to each other. to make 30 minutes you would probably need 6s and 6000mah minimum 5s 8000 or 4s 10,000mah. Thats a heavy pack. you will be better off going with a smaller pack and doing a swap if you want the buggy to handle properly.

Just remember, the lower the voltage you choose the higher capacity pack you will need to carry the same amount of energy.

If 30 minute mains are your goal I'd recommend the 1512/3d and a pair of 5s 4000mah packs and swap them at the 15 minute mark. If you want to be safe on making the runtime go with a pair of 5s 4300mah packs. Neuenergy has a deal going on some nice 5s 4300mah packs right now.