Electronics Repair Questions? Ask an Electronics Technician
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If still beeping, check whether the battery is in backwards.
Was it beeping before, and is the pattern of beeping quite unchanged?
If so, then the terminals may be dirty, this is especially likely, if the battery formerly in it were leaking corrosive material onto the terminals. If that could be the case, clean the battery terminals with cotton swabs or a rag cloth moistened in rubbing alcohol.