Here are our power supplies and converters. There are battery holders that charge as well as supply (like a mini power bank)
| 1PC MT3608 DC-DC Adjustable Boost Module 2A Boost Plate Step Up Module with/without MICRO USB 2V-24V to 5V 9V 12V 28V | https://www.aliexpress.com/item/1PC-MT3608-DC-DC-Adjustable-Boost-Module-2A-Boost-Plate-Step-Up-Module-with-without-MICRO/32925951391.html |  |
| TENSTAR ROBOT XL6009 DC-DC Booster module Power supply module output is adjustable Super LM2577 step-up module | https://www.aliexpress.com/item/TENSTAR-ROBOT-XL6009-DC-DC-Booster-module-Power-supply-module-output-is-adjustable-Super-LM2577-step/32340934616.html |  |
| DC DC 0.9V-5V to 5V 600MA Power Bank Charger Step Up Boost Converter Supply Voltage Module USB Output Charging Circuit | https://www.aliexpress.com/item/DC-DC-0-9V-5V-to-5V-600MA-Power-Bank-Charger-Step-Up-Boost-Converter-Supply/32968724707.html |  |
| MT3608 DC-DC Step Up Converter Booster Power Supply Module Boost Step-up Board MAX output 28V 2A For Arduino | https://www.aliexpress.com/item/MT3608-DC-DC-Step-Up-Converter-Booster-Power-Supply-Module-Boost-Step-up-Board-MAX-output/32970154203.html |  |
| 5V/12V 18650 Lithium Battery Boost Step Up Module Charge Discharge the Same Time UPS Protection Board Charger Circuit Li-ion | https://www.aliexpress.com/item/5V-12V-18650-Lithium-Battery-Boost-Step-Up-Module-Charge-Discharge-the-Same-Time-UPS-Protection/33032221967.html |  |
| Mini DC-DC 12-24V To 5V 3A Step Down Power Supply Module Voltage Buck Converter Adjustable 97.5% 1.8V 2.5V 3.3V 5V 9V 12V | https://www.aliexpress.com/item/2020-Mini-DC-DC-12-24V-To-5V-3A-Step-Down-Power-Supply-Module-Voltage-Buck/32826540392.html |  |
| DC 6-24V 12V/24v to 5V USB Output Charger Step Down Power Module Mini DC-DC Module Power Adjustable Buck Converter | https://www.aliexpress.com/item/DC-6-24V-12V-24v-to-5V-USB-Output-Charger-Step-Down-Power-Module-Mini-DC/32691466225.html |  |
| 5V 1A Micro USB 18650 Type-c Lithium Battery Charging Board Charger Module+Protection Dual Functions 18650 Micro | https://www.aliexpress.com/item/1PCS-5V-1A-Micro-USB-18650-Type-c-Lithium-Battery-Charging-Board-Charger-Module-Protection-Dual/1005002482112348.html |  |
| 1000mAh 3.7V 102050 Lithium Polymer Li-Po li ion Rechargeable Battery For MP5 GPS DVD tablet Bluetooth camera Lipo cell | https://www.aliexpress.com/item/1000mAh-3-7V-102050-Lithium-Polymer-Li-Po-li-ion-Rechargeable-Battery-For-MP5-GPS-DVD/33019840973.html |  |