Notes from the Team-Legit tech department:
This battery from Gens ace is a perfect high-capacity fit for FrSky's Q X7 and Q X7S radios.
Specifications
Capacity(mAh): 3800mah
Voltage(V): 7.4
Configuration: 2S1P
Net Weight(±20g): 140
Length(±5mm): 70
Width(±2mm): 52
Height(±2mm): 18.5
Wire Gauge: 20awg
Discharge Wire Length(mm): 45
Balancer Connector Type: JST-XHR-3P
Balancer Wire Length(mm): 45
Manufacturer SKU: GEA2S3800TXJS