US Charger:
INPUT: 100-240V-50/60Hz 1.0A Max
OUTPUT: 16.8VC ~ 1A

It is important that the charger does not charge the batteries too quickly or it will cause the life of the
batteries to be limited. DO NOT USE 1.5Amp or higher chargers

FOR INTERNATIONAL:
Use a Travel Adapter like the one shown below for multiple countries. As long as you use the US Charger
with the adapter, the current will be appropriately limited. Please be sure that your adapter is “grounded”.
Surge protection is always better but not required.
https://www.ceptics.com/products/ceptics-world-travel-adapter-kit-2-usb-2-us-outlets