VGEBY Lithium Battery, 18650 7.4V 1500mAh Lithium Battery with 5500 Plug Replacement Battery for RC Car Airplane Ship Model Toy : Amazon.co.uk: Toys & Games
18650CA-2S-3J Bak Technology, Rechargeable Battery, 7.4 V, Lithium Ion | Farnell UK
Electro River - 7.4v 1000mAh 30C LiPo PEQ Battery; Mini-Tamiya