But what if checking isn't enough? In my experience, batteries can seem fine one minute and die the next, even if you checked them. I've had similar issues where a full charge didn't last as long as expected. That's why I always carry spare batteries or a power bank now. It's more about having a backup plan than just trusting the check. A quick look won't tell you how much life is really left in a battery.
Read about a climber who fixed a frayed rope right before a big trip. That extra check probably saved his life lol. Makes you want to double-check everything now.