Here are our calculations comparing cost of using one use Duracells to rechargeable Schoolcells:

Prices for Duracell vary, but recently in a local Walmart, the best price I could find, they were over $6.17 for a set of 4. Schoolcell sells for $7.46 for a single set. Remember you get conservatively at least 25, usually you get over 30, charges from a set of Schoolcells. For 25 sets of Duracells you pay 6.17 X 25 = $154.25 dollars.

For the approximately* the same amount of power, for Schoolcell alkaline, you pay only $7.46. That's a saving of $146.79 per calculator for a 21 : 1 ratio. If you have 3 class sets of 30 calculators, thats 90 X $142.54 = $13,211 dollars saving. Could you find use for that money in your budget?

Cost for Duracells for 90 calculators: $13882.50

Cost for Schoocells for 90 calculators: $671.40

Don't forget you are reducing solid waste by at least 25 times too!