Mac Classic II: logic board battery connection

Hi everybody! this is my first post here!

I just got a defect mac classic II and I am in the process fixing it (at least trying to).
I removed the logic board. As expected, the capacitors have leaked. But worse than that, the battery also leaked and produced some oxidation.
So I unsoldered the battery support and ordered a new one (as well as a new battery and a complete set of tantalium capacitors...). The oxydation under the battery support was quite easy to clean. Some work with a magnifying glass remains to be done here:





The two battery connection points are annotated with a red circle.
Now the back of the logic board:


My problem is that I do not see were the "-" connection goes... it is alone. Is some wire missing here ? (=totally destructed by oxidation), particularly on the back side ?

Many thanks for advices!

Thanks, but including the shipping costs, even for europa, would not be that cheap...
And fixing the one I got is part of the fun!

I should precise that the logic board version is the one that have only two rom chips (not four).

For the whole story, the first time I powered up this Mac, it displayed four vertical bars (famous jail bar pattern). Then I removed the oxidized battery as well as its support and made some cleaning of the whole board. I then triyed powering it up again. It did not display the jail bar pattern anymore, but a uniform white screen (but still no statrup sound).

The battery "-" connection point which is alone on both side of the PCB is really strange. It would be nice If someone that own this version of the board could have a look at this.

Maybe a wire to the end of "L11" (back side) is missing... there is also another oxidized connection point on the upper left relative to the "-" connection point ...

Many thanks for the information! I wasn't expecting at all a sandwiched plane... there is indeed connectivity between the "-" connection point and the external metal of the rear connectors. So one of my concerns is solved.

Concerning the oxidized track you pointed out, there is indeed no continuity between the two flanking holes. I will then bridge them. With some luck, this will maybe allows the mac to start...

There is indeed at least one more track than need to be bridged (the hole that is up-left to the one you pointed out).

However, I was not able to solder a wire to the hole you pointed out. Despite a magnifying lens and an appropriate soldering iron, the melting do not attach to this point. Do you have any advice regarding this ? May I try to the corresponding hole on the opposite size of the board ?

It was far more easy soldering the bridge on the rear side.
This allowed the mac power up with the start sound and to boot the system 7!

However, I did not see any happy mac during booting, and once the system started, there was some chirping-creacky sound (not always).

After a couple of minutes, the system hanged (system error) and after a reboot attempt... the jail pattern again...

So, let's replace the caps now!