Advanced Search > Animal Repeller(37)Car(34)House(29)Hobby & School(10)Components(121)Transformer & Dimmer(31)Light+Sound(69)Radio & detection(7)Discount(6)Products A-ZModulesKitsCasesAssortmentsDevicesOther
M172N Power reserve
Power reserveYou can also use a commercially available USB buffer battery (not included) to provide an additional power reserve while cycling.
You can find buffer batteries online for purchase as "Power Banks".
You should choose a power bank that has both USB input and output, and it should permit charging and discharging at the same time.