Don't settle for anything less than the best for your Futaba components.
Futaba 6.6V 2100mAh LiFe Transmitter Battery for 4PL-4PX-8J-10J-14SG-18SZ Tx.
Radient LiFe 2S 6.6V 2100mAh 15C Futaba / Hitec Transmitter Battery
DYNU01 G16TA047H Laptop Battery Compatible with Microsoft Surface Go 2 2020 10.5 10.5" 2-in-1 Tablet PC Model 1927/1901/1926 i5 i7 Touch-Screen WiFi LTE Series(7.66V 26.81Wh)
G16QA043H Laptop Battery Compatible with Microsoft Surface Go 1824 Tablet(7.66V 26.12Wh)
6v NiMH 1600mAh RC Hump Rechargeable Battery + USB Charger - JST / Futaba UK
Rechargeable Battery Pack 6V 4600mAh SubC NiMH Tamiya Futaba Twin Lead Vapextech