I thought it was odd how long the interval was. But that would only buy a fix for the problem if the battery is finished. It has every right to be.
I'll check it later today, while doing the wife's watch battery. Pity they're not the same size, Ama-zon insist upon one buying 5 at a time. Handy service, but the free delivery we get means profligate use of fuel for small items.