Ultra-Thin LiPo Battery - 0.1mm thickness you can find here
Amazon.com: GOLDBAT 11.1V 5000mAh 3S 50C LiPo RC Battery Hard Case Pack with Deans Connector for Emaxx Axial RC Car Truck Buggy Truggy Vehicle : Toys & Games
Amazon.com: SUPULSE 11.1V 3S Lipo Battery 50C 1300mAh Soft Case Battery with T Plug and XT60 Plug for RC Airplane Helicopter RC Boat RC Car Truck(2 Packs) : Electronics
Amazon.com: HOOVO 4S Lipo Battery 9200mAh 14.8V 100C with XT90 Plug Metal Plates Soft Case for RC Truck Truggy Buggy Tank RC Car Racing Hobby (2 Pack) : Toys & Games
HobbyStar 5200mAh 7.4V 2S 100C Hardcase LiPo Battery Low IR