YUNBO Adjustable Voltage Power Supply Adapter AC 100-240V to Variable Voltage DC 3-12V 5A 60W for Dimmable LED Strip Lights - Amazon.com
Amazon.com: Compatible with Nokia AC-DC Adapter 3.7VOLTS DC @ 340mA 1.3mm Power Plug : Electronics
Amazon.com: Sabuly 3.7V High-Performance Replacement Battery for G Pro Pro Wireless PRO X Superlight G Pro Wireless M-R0070 Pro Wireless G1 with AHB521630PJT-04 533-000151/220mAh : Electronics
LG BL-59JH 3.7V 1800mAh LI-ION BATTERY + FREE SHIPPING - Brooklyn Battery Works
How To run AC 220 Volt bulb with DC 3.7 Volt battery |💡 |DC step up circuit - YouTube