A mobile phone charger works regardless of whether the charger is the right side up or upside down. As I know, batteries should not be charged with wrong polarity. How do those chargers accomplish that?
closed as off-topic by brhans, Michael Karas, Neil_UK, laptop2d, winny Jun 20 '18 at 7:58
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – brhans, Michael Karas, laptop2d
The input power supply is AC therefore, on a two-prong charger, the polarity is immaterial because it's always changing/alternating at 50 or 60 times per second: -
Internally the charger uses a bridge rectifier to convert AC to DC and it is the DC that does the charging. The polarity of that DC does not change when you rotate the charger.