Haze AGM Batteries

Just after some info on Haze batteries, has anyone used one or know of them. They are a german brand and their website is at www.hazebattery.com/HZS/cover.htm

Also I have a century MP600 as my crank battery which is 3 years old and possibly on it's way out. I have a voltmeter on my remco 100 house battery which normally reads 14.2 when no acc from this are on and have been driving for over an hour. Lately I only seem to get up to 13.8, if the century is near it's end of life would it be a extra load on the system which in turn is stopping more voltage going to the remco. I should still be within the charge voltage for the remco so that should be charging ok, 13.6 to 14.4 from memory, please correct me if i'm wrong.

Lorne............