Make your own RC Car Battery Pack or Repair NIKKO Ni-Cd 6.0V-620mAh - YouTube
VTG NIKKO Battery Mega Power Pack 7.2V-750mAh From The Netherlands NEW SEALED | eBay
Amazon.com: Redodo 12.8V 100AH LiFePO4 Battery with Low Temp Cutoff for Group 31, Deep Cycle Rechargeable Lithium Battery 100A BMS 1280W 4000+ Cycles, Perfect for Trolling Motor, RV, Solar and Off Grid :