Ploberger NiMH light convert to Lipol battery with charger

I was tired always removing NiMH battery for charging when light was weak. So i designed adapter where is Lipol battery BM41 from cell phone and charger for Liion battery with batt protection from China. Charging is from USB. Printed parts do not fit exactly to original Ploberger parts, i had to little rasp them. All parts are glued together. LEDs on charger PCB is inside. I need short piece of transparent filament to better wiev, but i have not.