My old 30 euro charger from a Berlin market died during a train ride to Hamburg, and I swore off cheap bricks after that. I used to just carry a big power bank, but now I keep a spare 65W Anker charger in my bag at all times. It feels like overkill until you're the guy begging for an outlet with 5% battery. The power bank is still my backup for the phone, but the laptop gets its own dedicated backup charger now.

Left mine for a month once, but that's pushing it. My fridge runs cold too, so I try not to go past two weeks now. Learned the hard way like you, had a starter go gray and watery.

Ugh, that's the worst. Honestly feels like half of life's problems are just a bad connection or a loose wire somewhere.