Just to close the loop here - a brief update. I finally went back to my stock battery. I had a low voltage warning until my first long-ish drive. Since then it has been gone and there are NO problems with CA nor with the date/time memory. Problem cured as I much suspected it would be.
Does anyone know of a battery by BWM or their battery supplier that is lighter, the same form factor and about 60 Ah or so. This would be a great replacement for those of us in warmer climates looking to save weight without any reliability problems.
E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK |
| Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors |
| Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels |
| XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit |