The choice between alkaline and lithium-ion batteries is not about one being universally better; it's about matching the chemistry to the device. Alkaline cells—AA, AAA, C, D, and 9-volt—are inexpensive and work well for low-drain gadgets like TV remotes, clocks, and wireless mice. They are single-use and can sit in a drawer for months without losing viability.
Lithium-ion batteries are rechargeable and pack more energy into a smaller size, making them the standard for smartphones, laptops, cameras, and cordless power tools. They require a charging circuit specific to the battery pack, and should never be thrown in household trash because damaged cells can start fires. Disposable lithium AA and AAA cells are a separate category: they cost more than alkaline but perform better in high-drain devices and in extreme temperatures from -40 to 140 degrees Fahrenheit.
For businesses managing fleets of devices or consumers who burn through batteries quickly, rechargeable Ni-MH batteries in AA/AAA sizes offer a middle ground. They are not lithium-ion, but they work in most devices designed for 1.5-volt disposables, though they typically deliver 1.2 volts and some voltage-sensitive products may not accept them. Always check manufacturer compatibility before substituting battery types, and dispose of lithium-ion cells at dedicated recyclers, not in regular bins.