Next time you remove the battery, it might be a good idea to check whether or not you’re already driving on the reserve fuel tank. And if you are, how much of it you’ve already used up.
But if you fail to do either of those things, at least have the brains to fuel up at the first opportunity.
The meter might show that you’ve only driven 30 kilometres on the reserve and you might think that you have 20 kilometres left. But trust me on this: you don’t.