HP 15c Collector's Edition save/restore does not work

[Johnh]

Thanks fir the great insights into my battery problem, and so it's a direct parallel connection of the two batteries that is intended.

Opening up to get right inside needs the rubber feet removed. I kind of like them, they are solid and neat. How likely is removal and replacement of them going to risk a less than good result? eg damage, unevenness or a tendency to fall off?

I may pursue a work-around just within the battery compartment, as discussed above.