Patent ID: 8148940

Claim:
A multifunctional vehicle charger comprising: a charger portion; a power plug corresponding to a power outlet in vehicles disposed on one end of the charger portion, a wire coupled to the charger portion and connected with a power terminal for charging interconnection to a lithium ion (Li-ion) battery; and a Universal Serial Bus (USB) port disposed on the charger portion for interconnection of electrical appliances having charge monitor circuits and Li-ion batteries by a corresponding USB connecting wire; wherein the charger portion includes a charge monitor circuit coupled to the wire with the power terminal, and the USB port is directly connected with the power plug; wherein the charge monitor circuit selectively actuates a plurality of alternative charging modes responsive to a voltage of the battery being charged, wherein alternative charging mode includes: a low-current fast pulse charging mode, a constant-current float charging mode, a constant-current equalizing charging mode, and a constant voltage charging mode.