I keep lithium batteries in my backpacking gear repair kit. I do this to reduce my ultralight pack weight since lithium batteries are 1/2 to 1/3 as light as alkaline batteries.
However, lithium batteries also provide many more benefits besides lighter weight and if you’re not using them today, you should consider switching.
For example, lithium batteries provide 2 or 3 times more power than alkaline batteries, making them far superior for high drain backcountry gadgets such as digital cameras, GPS and Personal Locator beacons. They also perform far better in cold, winter conditions where you can’t afford to have your batteries die on you and they have a shelf like of 10-15 years because they drain far slower than other commercial batteries.
Disclosure: The author owns this product and purchased it using their own funds.