04-09-2009, 04:02 PM
Even if you get one of those battery gizmos, it still sounds like the guy screwed up the installation by installing the wrong springs. If you could open the door manually before, it should open manually now. The battery backup should be an add-on convenience, not a replacement for a correct installation. As someone else mentioned, you'll probably burn out your garage door opener early if the door is not properly counterbalanced.