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Ok, I had my MRC 989 "fixed" under warranty but it happened when I tried to charge-discharge, multiple Prius modules (aka., 6 cells each.) IMHO, the MRC 989 handle single modules OK but multiple modules presents a problem beyond the technical capabilities of the MRC 989. Speculation on my part but the MRC 989 can handle reasonably balanced cells but with more than one, multi-cell module, the excellent, dV/dt logic is defeated.
The other poorly documented feature is the specified, Ahr limit is ~7/8th, of the actual charge limit. If I set the charge limit to 1,000 mAhr, the MRC 989 only stops charging after 1,250 mAhr. Yes, I will join the 'AMEN' chorus but this is how it works.
You have my apology if anything I'd previously posted led you astray. Other than a computer programmable charger, I still believe the MRC 989 is the best, if poorly documented charger.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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