Long, long life.

9 volt comparable at a better cost

9V alkalines always just seem to disappoint. I now only buy these and use them in smoke detectors, electrical multi-meters, studfinders, clocks, and everything else.

Batteries last a lot longer than alkaline and you never have to worry about batteries leaking acid.

Ever opened a seldom used meter or radio that you found didn't work to find an alkaline 9v mess? Go Lithium for a long, leak-proof life for these usually expensive devices. These add a sense of reliability and guaranteed life to your smoke and CO2 detectors, too.

They seem to be very good. I gave it a 4-star only because I haven't had them long enough to evaluate their performance over the long haul