The Charger wasn't working for me at the beginning because in order for start working its needs to have a minimum of 15 volts in the batteries if not charger will not start working as well of the bluettooth fixture. Once I manually charger the batteries charger start working but I coudnt get the blue tooth to work.
Wanted a new charger, chose this one because of the variable voltage input feature. It can be used with 120V or 240V making it faster and more efficient to use. Well built and heavy duty everything. Enjoy using the smart phone app, can see the state of charge on my phone.