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With a load, the ammeter display of my EMS will show a few amps with a numerical value before engine start, as expected. But with the engine started and alternator on, the meter shows a zero numerical value, and the display bar is pegged to the bottom (see side by side before and after photos --...

My EFIS-D100 is 15 years old, and my logbooks show no indication that the internal battery has ever been replaced (I am not the builder). Are all of the EFIS settings and configurations saved in some form of non-volatile memory, or will removing the existing battery require the unit to be set...