16 Sep 2012, 09:46
On the Hughes modules one battery powers up the display the other powers up the timing circuit, check inside the negative battery well you will see the edge of a copper contact, this is the contact point for the timing circuit, make sure that this is clean and in permanent contact with the battery, you might be able to carefully bend (tweak) it a little in order to get a better contact, when correct it should be strong enough to hold the battery in position and stop it falling out. I would separate the board from the plastic carrier and clean up all the other contacts whilst I was at it.
No guarantees it will work but definitely worth a try.
Good luck.