Zetta Industries' max-sized big battery. 3.906 trillion RF capacity. Important info in comments. : r/feedthebeast
DIGIPOWER RE-FUEL RF-TC-55S TRAVEL CHARGER FOR SONY DIGITAL CAMERA BATTERY 758302072804 | eBay
Wireless RF Battery - Official Feed The Beast Wiki
Replacement Batteries for Boogey Lights RF Wireless Remotes
433mhz RF DC 3.7V 4.5V 6v 12V Battery Power Mini Wireless Remote Control Switch LED Lamp Controller Micro Receiver Transmitter|Remote Controls| - AliExpress
DigiPower Re-Fuel 9-Hour ActionPack Battery for GoPro RF-6H50