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2 x PP3 9 volt batteries connected in series produces 18 volts.
whereas if connected in parallel, they produce 9 volts but with double the mAh rating.
There are/were detectors that while having 2 power sources, one was purely to power the speaker so is it possible that with your one battery fitted the detecting function works as it should but the speaker is inop due to no power supply. Just a thought. Regards ss47
To be wired in series with 8 aa batteries making 12v. I did notice that this 1236x2 was assembled in China so maybe just used different components to the older ones ie the 1266x 1265. Thanks again.
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