Oh no! another galley flat failure, i’m glad its not a catastrophic failure and can be patched. Out of curiosity were your battery & galley module bolted down, or could they have bounced a little? There have been others on the forum with similar issues. I made a recommendation back in august on this thread http://teardropforum.com/forums/topic/anyone-using-12v-lithium-battery/
Adding the strip of glass at this point would probably be better on the galley side not cabin side. It would be less visible and offer similar strength. You could also inject some epoxy into the failed plywood cracks and use a jack under it and some weight on top to “clamp” and press it flat while it cures.
This fix however will not prevent further damage if you mount the battery in the same location. I suggested using a bolt in battery box that hangs from the bulkhead. This mounting method will support more weight than the galley flat even with an additional glass strip. The galley flat is not designed for the concentrated weight load of AGM batteries, and I hope CLC correctly addresses this issue.
I’m not familiar with their galley module but if its not already mentioned securing the module to the bulkhead or at least the galley flat will also reduce stress on this joint. This joint can support a fair amount of STATIC weight but Dynamic loads are like a hammer… and it will fail.