panamamike wrote: ↑
Wed Mar 04, 2020 3:03 pm
I was referring to non BMW dealers. Did they actually fill out that form, looks empty.
Those look like 2 different battery logs, one with a 4-week and the other with a 3-month monitoring frequency. I think that the 12 V battery in even a new i3 should be monitored more frequently than every 3 months, so maybe the 4-week battery log would be used with an i3.
The logs' focus is on the 12 V battery which does discharge while a car is parked. There is no column for EV battery packs, probably because they have a very low self-discharge rate and no vampire drain except for Tesla battery packs and thus needn't be monitored.
One log does have a "Voltage Hybrid" column. The possible values in this column are charge level (0, ¼, ½, ¾, F), not voltage. Li-ion hybrid battery packs have a very low self-discharge rate and don't have any vampire drains, so if a hybrid is parked with a charge level in the form's green range, ½ or greater, it should remain at that level for many weeks or months. That wasn't true for earlier hybrids whose battery packs contained NiMH cells that have a significant self-discharge rate. However, I don't think that any BMW hybrid has a NiMH battery pack.
Regardless of whether a dealer fills out a battery log, as long as an i3 is parked at a charge level that isn't too low, its battery pack wouldn't be damaged. Maybe the most likely situation that could cause damage would be if a REx were parked with its charge level so low that the REx engine was running when parked (i.e., charge level <7%). However, the early failure of many i3 12 V batteries could be due to their being allowed to discharge significantly while i3's were parked on dealer lots.