Broken 1975 CASIO Pocket Mini Calculator P-810 Repair

Hi, in this tea break fix we have a 1975-1977 Casio pocket calculator that has no power. It was sent to me by a viewer called Gordon. It has had battery leakage, and even though it has been cleaned up, it is still not working.

Link to the unofficial Facebook My Mate Vince Fan Club (right now this is the only one ????) https://www.facebook.com/groups/174767147176946/?ref=share

I now have a PO box here in the UK, so if you would like to send something in that MAY be featured in a repair video, then here is the address. No items will be returned, so only send it in if it is of no value to yourself.

PO Box 2597
Watford
WD18 1HT
UK

I don't think couriers send to PO boxes so in the UK it would need to sent via Royal Mail.

Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things. I do love fault finding and trying to fix broken things, so I hope that comes across in this 'Trying to FIX' series. Many thanks, Vince.