Caught a sneaky issue with backup battery installations

I was putting in a new backup battery for a comms system and almost missed a key step. The polarity markings on SOME units are SUPER faint and easy to overlook. Connecting it wrong could fry the entire avionics suite. Double-check those labels with a magnifying glass if you have to.

Rant: Everyone says meal kits are perfect for new cooks. Mine was a disaster.

Quit bringing up the author's other books in debates. Now we actually talk about the book we read.