Thanks for all the replies. I bought a couple of 4s 4900s and a couple of the hardcase 2s 5000s. The hardcases are for my 1/10th race cars, but the 4s 4900s are to get my e-8ight running finally.
E-CRT.5 Monster - RCM chassis, MM/Medusa 50x3300/3s, truck tires, 1/8 shocks
E-CRT.5 Stock - Sidewinder/4600/2s, buggy tires
E-8ight - Tekin RX8 2000kv/4S
E-8ight T- Tekin RX8 1700kv/5S