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I received my battery replacement kit and measured the o ring. It appears to be a standard size AS568-026. Available on Amazon at $5.52 for a bag of 100. I'll confirm after I return from vacation, order, and compare. The battery is supposed to last for 2 years.I am looking for replacement o-rings for the battery compartment on my Wisdom 2. Seems easy to find the kit, but not the o-ring by itself. Can anyone provide a source, reference, or specs?