Just adding my two cents to what the others said; When it comes to cheap electronics, ( IMO ) it is not unusual for the charger to go up first. Some localities have big time voltage swings off of their main grid. Not unusual to see cheap electronics taken out by voltage surges. I've had chargers and other more expensive appliances go up due to voltage surges. It happens. This is why I always suggest doing the following: Never charge batteries when there is not someone present ( who understands the danger ) to watch over things...AND....use a surge protector on all electronics that operate or charge off of line-voltage.