Electronics Repair Questions? Ask an Electronics Technician
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What kind (or brand, or maker name) of safe do you have, please?
I'm not sure what to offer in the way of advice for this problem.
But a question: did the batteries in the safe ever get left for long enough, that they both got weak and also leaked brown fluid or paste?
OK. Before putting in new batteries, I suggest that you use cotton waste, or cotton swabs, mositened in rubbing alcohol, to clean the battery compartment terminals in case they are dirty and in case the problem is with low voltage supplied to the safe from the batteries. Then try the newer batteries in it.