7.2 V/7.4 V/8.4 V 18650 Lithium-batterie 2600 Ma Akku Megaphon Lautsprecher Schutz Bord 2.6a Battery Pack - AliExpress
Amazon.com: melasta 8.4V 4200mAh Hump NiMH Battery Pack Fit for Tracxas RC Racing Car Truck Boat Tank RC Hobby, 7-Cell Rechargeable RC Nimh Battery : Toys & Games
VB Power 8.4V 1600 mAh stick NiMH akku - Mini Tamiya - MilGear