e cig battery charger

the wife uses these ecigs and was forever complaining about the crappy chargers so i decided to try and see if i could help.. i designed this double battery charger with voltage displays and a better charge system ( tp4056 boards ) i took the 2 battery holders from 2 old chargers. and used the usb wire from 1 of the cargers to supply power to the 4056 boards,