Are my batteries shot?

Hey guys, I recently went a month long trip and when I came back my battery has been behaving weirdly. I’ll turn the board on and the percentage indicator says “0%.” Then, I plug it in and it instantly goes to 100%. After a few seconds that indicator slowly goes down to 0% again. Are my batteries toast?

EDIT: Using 5 2S 5000mah Turnigy batteries as well as a 10S Bestech BMS.

Measure the individual cells on the balance connector and you should find something that’s off.

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It could be one of your batteries is shot and so it’s tricking the system bc the current isn’t strong. But when u left for the trip did u have your board charged around 80%? And if you did u could be short-circuiting causing the board to slowly lose charge.