if you are having bike you can charge your mobiles.
1.Bike having 12 v battery
2.and car charger any compatible one for yours
6.some tape and 2 meters of wires
tag second one -ve as 2 nd
for frim ness i used tie tag and glue gune to avoid any short circuit
now cover the wires with tapes
the switch is dpdt
now take one wire for switch one for middle and another one for another end
now the charger was completed.