|Hi Uncle, here in the UK oem power supply are relatively inexpensive. Google:-|
lenovo v570 power supply
to find the *correct* one for your laptop.
With one, you should be able to run the laptop, even with a virtually dead battery.
Remove and replace the battery 3 or 4 times to clean its contacts,
Consider purchasing an oem battery, also inexpensive,
Do not go for the cheapest, instead look for a higher wattage than the original, and a 1 or 2 year guarantee..
Good Luck - Keep us posted.
message edited by Mike Newcomb