You have an application using an instrument that needs 12 volts (nominal voltage).  The instrument is remote from a power outlet.  Every hour, on the hour, it turns on for ten minutes automatically.  When it is on it draws 75 milliamperes.  You have several options on batteries.

Option A.  Buy some alkaline batteries and put them in series to get the required voltage.  Each alkaline battery has a nominal voltage of 1.5 volts and you will need eight batteries to get 12v.  Each battery stores .75 ampere-hours and costs $1.01.  If you buy 10 to 24, the price drops to $.85 each.  Above 25 the price is $.54.

Option B.  Buy a twelve volt battery with .75 ampere hour capacity that costs $10.00.

Option C.  Buy a rechargable nickel-cadmium battery.  A 12.2 volt battery with .45 ampere-hour capacity costs $67.82.  With a recharger you can recharge one in two hours.

        Determine which option is best and explain your decision so that a non-Electrical Engineer can understand your explanation.