I'd ask for a picture of the battery connector at the bottom of the board.
As I found out very recently, they don't like liquid, the copper corrodes turning the connector a green/blue colour. It's easily fixable but just a pain for you.
If it's been well looked after, shouldn't be an issue. Mine sat in cupboard unused for a few months and I must have not cleared all the liquid from the 510 and it's dripped down. My own daft fault.
View attachment 176219 View attachment 176220
Doesn't want to look like these photos! All fixed now though thanks to a very kind fellow Ape.