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Well look at in in terms of batteries deposited per year in the landfill: 0.1 or 1.

Two AA batteries is about 16 cm^3 of waste. 10 CR2032s is about 10 cm^3.

"Number of batteries" is not the right thing to measure. Maybe volume isn't either, but it's got to be closer.

Probably volume and type of toxic materials are the best metrics

GAAP requires you to accrue your batteries deposited in landfill, so back to 0.1 per year (/s if not obvious)