An ultra-portable water purification system (1). The system (1) can include a pump (22) for pumping water under pressure through the water purification system (1). The system (1) can also include a battery (14) for supplying power to operate the pump (22), a power source (10) for providing power to the battery (14) and the pump (22), and a charge controller (18), electrically connected to the power source (10), battery (14), and pump (22), for regulating power received from the power source (10) and limiting the power provided to the battery (14) to power the pump (22). The water purification system (1) can also include a mesh strainer (20) upstream of the pump (22), a sediment filter (26), and an electropositive filter (30). The mesh strainer (20), sediment filter (26) and electropositive filter (30) are arranged in series such that the source water is pumped sequentially therethrough.