Works for the Kraken Vesla aswell as below, just need to change terminals over, but these are top of the line batteries for your 1/5 scale.

Gens ace 8000mAh 14.8V 100C 4S2P Lipo Battery Pack with EC5-Bashing Series is suited for Arrma 8S, like Kraton, outcast.
Specs:
Product Type: PC Case Lipo Battery Pack-Bashing Series
Capacity: 8000mAh
Voltage: 14.8V
Net Weight: 737g
Dimensions: 157*55*42mm
Balance Plug: JST-XHR
Discharge Plug: EC5

Features:
Large-capacity battery specially designed for ARRMA vehicles to maximize battery life.
Better grip in the battery tray .
PC material and silicon rubber case provides dual protection