To recharge your Fabulous Storyteller, you can connect it to a standard external battery, such as those used for smartphones. For the sole purpose of recharging your device, you can use any USB cable compatible with My Fabulous Storyteller.
N.B.: to transfer stories via the Luniistore™, the only suitable cable is the original USB cable supplied in the box. This cable is designed specifically for data transfer (it sometimes features the indication "data transfer"). Indeed, not all (apparently compatible) USB cables allow data transfer. They are often limited to the recharging function of the device.