UPDATE:
Looking at Tod's videos from TNT amusements I noticed they had started to fit coin cell holders to DE and Sega machines.
I found a small holder with an on/off switch and shared my findings along with some insight and video's on this thread..
http://www.pinballinfo.com/community/threads/coin-cell-holders-remote.13635/#post-80030
The results were not what I had hoped for but at least we now know what to expect once this system has been working for a while. I do wonder if Tod has had similar issues?
Anyway here is the work/experiment:
With the old battery holder removed and the new cell holder fitted and wired up.
Time for some memory tests.
The machine was set up and some text added to be remembered once turned off and on again.
It worked! Well sort off?
For the first week I had no issues what so ever so decided to drain the battery slightly but taking it out and using it on something else that draws a little more current.
I doubt I used 5-10% of the battery life before it lost the memory and I started to get the 'open door' message after turning off and on again.
I had hoped that it would be reliable as these lithium coin cell batteries are "supposed" to give a good constant voltage until nearly completely drained.
So it does work but not for long on this DE machine. A good quality brand battery was used.
Its just too close on the voltage to be reliable
So I soldered some remote wires to the original holder and mounted it on the side of the back box and we are golden again
