How doest the case for the VA-IH009 open? There are not any obvious screws or tabs to gain access to the battery.
BTW, the battery is just about shot after almost two years. Needs replacing. Someone tried to tell me that button cell CR2032 batteries were the thing for the VA-IH009… That doesn’t seem right in my experience, but I am happy to be shown something different if it gets my system back up to snuff!