Disposable alkaline batteries are not perceived by most people to be rechargeable, and that’s how the manufacturers like it. Until digital pulse-technology chargers came out a few years ago, it was NOT an option for most people. Alkaline battery walls are very thin, and the heat generated by simple brute-force recharging frequently split them open with a bang.
There are new chip-controlled chargers which will safely and effectively recharge “disposable” alkaline batteries. I have a Buddy-L Super Charger, one of the first designed this way. Bought it about 7 years ago, and I still use it to recharge all my alkaline batteries. Saves me a BUNDLE!
The newest of the new chargers claim to be able to charge Ni-Cad, NiMH, AND Alkaline in the same unit. (Don’t know if this means mixed types at the same time.)
[The manufacturer is currently working on an updated version of the Battery Xtender. Until then, it appears this product is no longer available. ]