Reliability of batteries and their damage to equipment

[Jon A.]

Originally Posted by VintagePC

That might well arise from the inner construction - many 9v batteries contain 6 AAAA cells within, so if those leak, there's still the outer "shell" to contain the mess.

Good enough for me. I had an alkaline 9-volt backup battery go dead in an alarm clock earlier this year, but no mess. The 9-volt lithiums I see would probably be overkill. I have some remotes that use 9-volt batteries. One theory of mine is that they could be made to more stringent standards (the outer shell) because of their use in smoke detectors.