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The original test circuit checks and latches a dropout condition on 12V only
choose 9~24Vdc or so piezo device not a magnetic speaker.
When +12V fail condition is detected the speaker will draw current from the battery and after a while the battery will be drained. :roll:I do not recommend charging any type of lithium battery, sometimes those may explode… And what’s the point for charging if we get a zero stand-by current circuit? :roll:
Yes, you may add supplementary monitoring LED’s to any of the +5V/+12V using series limiter resistor( 1k to 2.2k).
gotcha no direct tech support. Got Service manuals ? I imagined you were testing many in parallel. Not one at a time.