I got a jumper pack here which I haven't used for a couple years so assumed it was dead. Today, it's started ticking, not clock spaced ticking, more like ten clicks a second, and it's continuous.
What the fk is a matter with it? Is it about to explode???
Basically, it's just a motorbike battery in a box, with some very basic charging circuitry, maybe a small compressor. There's not much that SHOULD tick in there, unless it's plugged in?
I think I'd be shoving it outside, just in case...