can i use a converter (240V to 120 V) to recharge my shaver for 12 hours or will the converter burn out?

Answer 1

Most of the portable electronics (cell phones, shavers, tooth-brushes, laptops) have power converters that work at both 120V and 240V. So, check the ratings of your converter. If it has something like: 100V-240V/50-60 Hz, then you have nothing to fear.