I recently got a used, non working at the time spin. I took out the battery and held down power and the laptop turned on. I reconnected the battery and the laptop would stay on for about a minute with the charging light lit up then the laptop would turn off and not turn on again until I had both unhooked the battery and held down power button for 20 secs and also had unplugged the charger too before it would turn on again. Without the battery connected it will stay on indefinitely. Connect the battery and it powers off after couple of mins and the aformentioned proccess has to be done before it powers up again. So I bought another OEM battery from Best Buy which came today. It had 75% charge on it and the laptop works fine.
However if I connect the charger the chargers internal breaker trips and the battery does not charge. I can get the charging light to light up for 1 second before the breaker trips again. The laptop had suffered some moisture damage which is why it came to me non working. What could the problem be? I haven't yet taken off the copper heat sink sheet from the motherboard to see what it looks like underneath. The rest of the board looks fine. The moisture sticker has turned red though. Does it look like I need to change the motherboard on the laptop? I'm guessing it will. But maybe there is a fault protector circuit I can manually reset to stop the charger from shutting down if there is a battery connected to the system.
[Edited the thread to add issue detail]