I'm reposting these comments from the same reply about another charger.
Alkaline batteries are not really designed to be re-charged, and I think most people realise this. Charging Alkaline batteries in an ordinary cheap NiMh or NiCd charger can actually be unsafe as they do not stop charging at the correct point, so if left too long the alkaline batteries can start to overheat and leak. This is to do with the physical properties inside the battery, and although there are chargers out there that will charge an Alkaline battery it is not widely accepted to be safe to do so, as well as the fact that to recharge an Alkaline battery is a bit finicky. If you do manage to find a charger with a voltage regulator that can be used on alkaline batteries, it will probably be expensive and you have to charge them before they are completely depleted. Universal in the description of battery chargers always refers to the fact that you can charge different size batteries from AAA to D, as well as the the common rectangular shaped 9v batteries (as long as they are metal hydride and not alkaline).
Something else to consider is that recharging Alkaline batteries may seem to make sense as they are so much cheaper, but it is false economy because while Alkaline batteries can only be recharged about 10 to 15 times before they are irrecoverable, nickel metal hydride batteries can be recharged 500 or more times.
My advice is to keep the charger and invest in a few packs of NiMh batteries so you always have a fully charged set to hand.