beginner: the unused half of a dual opamp

Hero999 said:

Because he's an audioguru and as far as he's concerned the only use for an amplifier is for audio.

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Well I'm sure most people here, including AG, know that audio is very much an after thought for opamps, with their original use been in analogue computers.

I have made many audio and video amps. But I have never made a battery voltage/current monitor (except plenty of circuits with a zener diode that dims an LED as the battery runs down) nor a light meter.