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Rechargeable Schoolcell XL battery vs
single use battery cost comparison.

Prices for Duracell vary but recently in a local Walmart, the best price I could find was $6.17 for a set of 4. Schoolcell XL sells for $9.89 a single set. Usually you get over 200 charges. For 30 sets of Duracells you pay 6.17 X 30 = $185.10 while for Schoolcell XL alkaline you pay $296.70 for 30 sets. That appears to be a big difference but lets do some math.

Since you get over 200 charges for the Schoolcell XL, let use that number for our calculations for 1 class set of calculators:
For 200 class sets of one use batteries, the Duracell would cost you $3720.00 (185.10 X 200)
For Schoolcell XL, 200 charges would still cost you that same $296.70. Your savings : $3720 - $296.70 = $3423.30 by using the Schoolcell XLs. Remember you usually do get 200+ charges for even greater savings.
Do you have 3 class sets of calculators?
For 3 class sets of 30 calculators, that's just under 10269.90 dollars in savings.

Don't forget you are reducing solid waste by at least 100-200 times!