The hahnel unipal mini universal charger is compatible with li ion 36v37v38v and 72v74v batteries with just a quick adjustment of the contacts using the fine adjustment wheels you can charge a huge range of batteries 34 smaller in volume than previous unipal universal chargers the unipal mini can charge from a large variety of power sources including power banks mains usb power sources such as a laptop or car batteries a bright lcd display shows the charge status for ease of u