First of all, it doesn't accommodate extended-life batteries. That would be worth mentioning on their web page, but no such luck. I finally gave up and used the original-equipment charger to finish the job, which took about an hour or so. It looks identical to the original normal battery that came with the phone, but some subtle difference in its plastic shell must be present to keep the Audiovox from latching it into place. I'd still love to own a real dual, or twin, charger for Audiovox CDM-4000 batteries, so I could charge a battery without having to use the phone itself.
Home is where the heart is.