Thank you Milesyoung for your advice, according to the data sheet of the Lithium-ion Battery show that over charge will cause no fire no explosion and because I don't have much space and wight and need for high capacity I think the Lithium-ion Battery is perfect for me and the data sheet for...
My idea to use converter from AC-DC and use anther converter DC-DC to get the right voltage and current to charge Lithium-ion Battery (5 batteries Batteries on the parallel link) and covert the 3.6V to 12V to supply it for fan blower, I don't have much experience with electronic I need help with...