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There are 2 snaps on the top, there is no need to remove it complete…
First remove the top.
Then you have access to the lithium cell.
Measure it. It must have 3V, not less… + is top of the batterie, – is ground of the box.
If less, ok, dismount the box complete. You have to replace the cell.
If 3V is ok, just close it and assemble it.
But 30 years of time… no lithium cell will last much longer.
- This reply was modified 2 weeks, 1 day ago by Die_Bogener.