The XT UI1 is a portable USB battery charger with a max charging current of 1000mA. It has powerful compatibility with a large range of 3.6V and 3.7V rechargeable Li-ion batteries, including large-sized batteries such as 20700 and 21700s. The intelligent charging mode automatically selects the optimal charging modes (CC and CV). It also features a micro-USB port for outdoor charging for use with power banks, solar panels and USB adaptors. The explicit and simple power indicators on the UI1 provide real-time display of battery level and charging status.