Rechargeable Batteries Question

Rechargeable Batteries Question

I found an Electronic Dance Maker today at a garage sale for fifty cents. I bought it since I figure I'll probably never be able to afford Dance Dance Revolution... Anyhow, while reading the instructions, I noticed that it says I need to use three new C batteries and that they are to be the non-rechargeable type. Does anyone know why I should not use rechargeable batteries for my dance pad? Is this a safety issue? Would rechargeable batteries break my toy? Or is this a ploy to make me keep buying new batteries? Does anyone have one of these and use rechargeable batteries with it?
Plant Identity

Plant Identity

Bee balm!

Bee balm!

BEFORE AND AFTER

BEFORE AND AFTER

help! weeds?!

help! weeds?!

City flowers

City flowers

Nasturtium – Alaska Mixed (flowering herb that taste peppery)

Nasturtium – Alaska Mixed (flowering herb that taste peppery)