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I've used a battery disconnect when not using the car since new and never had any issue with the ECU "forgetting" the adaptive settings - either when standard, Stage 1 or, as now, KH stage 3.
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That the adaptive maps are stored in volatile memory and lost upon power disconnect is not conjecture on my part or internet lore-I took that information from the S & S Protune manual page 87 paragraph 9.5.

In your case I would imagine the adaptation was slight enough you did not notice the change and/or the new maps built quickly enough to mask the change.

In my own car, after a change to a cat-less straight through exhaust, the change from adaptive maps to baseline map after using the battery disconnect was quite noticeable, and it took 15-20 miles of running for the engine to return to its previous happy self. Merging the maps eliminated this. In all I did three maps merges after 100+ mile variable condition drives. The last one showed minimal change from the 2nd one, so I've stopped there. The Protune software allows you to visually and numerically compare maps, assuming you saved your previous versions

Last edited by Bitsobrits; 01/02/19 05:15 PM.
Steve
Late 2012 M3W