I'd get the battery checked first, sounds like a dodgy cell.
Then check the vehicles electrical system with a volt meter after 24/48hrs, if there is still a voltage drop you have a problem.
Yes, I've seen it, now you have a look at Putin's record of past deals,
here, https://edition.cnn.com/2025/02/27/politics/video/trump-putin-zelensky-russia-ukraine-war-burnett-ebof-digvid
Your story has touched my heart, now go away and think about the consequences for Ukraine if he had unconditionally signed said agreement.
You and your ilk might trust Putin but I'm sure not many others in the free World do.