Futaba TX Battery pack. Also fits the following cars for RX packs:

MCD, Losi 5T (all ages), Kraken Vekta, Kraken Vesla,Traxxas Slash, Emaxx version, HPI Strada XB 1/10 RTR Electric Buggy, Kyosho GP 4WD RACING TRUCK etc

Specifications:

– Minimum Capacity: 3500mAh
– Configuration: 2S / 7.4V / 2 cells
– Net Weight(20g): 142g
– Dimensions: 97mm Length x 45m Width x 16mm Height(2mm)
– Balancer Connector Type:JST-XH