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Spare battery for a dive computer is a good idea to me but then I take everything I can. Anyway, there are a number of different sizes for various brands, and round quarter size could any one of a few. CR2450, CR2032, CR2030 seem to be popular from LP's computer battery listings altho I get my cheaper on Ebay, but whichever - with the right number from the old one, I would think they could found. How much trouble it would be to chase one down would be the question. They are tiny, light, and inexpensive so if your is a year old or more, yeah replace or carry. 
Gordy, the CR2036 looks like a smaller, watch type? Which computer do you dive?

Gordy, the CR2036 looks like a smaller, watch type? Which computer do you dive?