Sized Cell

What happens when you substitutea same volt but different sized button cell battery in a device?

My spouse substituted a C cell for an LR44 and the device died within 7 days. He claims it was not the fault of the substituted cell battery - I claim it was! Who is correct and why?

The voltage should not have been an issue since C-type batteries are generally 1.5 volts, just as the LR44 batteries are. The main difference between these two batteries are capacity. C-type batteries have a larger capacity (i.e. they last longer) than the LR44. LR44 batteries are used for devices (e.g. an LED light) that have a lower drain than those that typically require C batteries (e.g. a Yamaha keyboard).

My main question is: HOW was a C battery substituted for an LR44 when C batteries are so much larger than LR44? Perhaps the failure has to do with the method by which such a substitution was made possible.

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