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.
From my own mess-ups, reversing LEDs rarely causes harm! They're built to handle reverse polarity without frying the circuit. Just flip them back and you're good to go!