https://alexnld.com/product/isdt-c4-air-4a-6-slots-usb-type-c-input-smart-charger-with-app-connection-for-aa-aaa-li-ion-rechargeable-battery/?hilite=Doublepow 1.5V 1000/2400/3400mwh USB AA/AAA Rechargeable Li-ion Battery