My laptop power supply is rated for output to 19.5v, 7.7A.
However, it's kicking out 41.5v. Strange thing is that before I measured this voltage, I have been using it to power on my laptop and it works fine. There's a problem, however; I've been trying to understand why my battery doesn't hold a charge. I have it plugged in and it charges (according to my battery manager) up to 84% and never higher than that. The status also reads to be "plugged in, charging." When I disconnect the power cable, the machine shuts down and cannot be restarted with only the battery. I have to plug it back in to get it to restart.
Why would it do that and can I fix it? Is it still safe to use to power up the laptop, which requires a 19.5 VAC power supply even if it's kicking out so much more voltage?