The charge problem I described in this post seems to have been solved. The cause was a simple one. The battery was not seated in the slot properly. I’d had some difficulty to close the case properly and that seemed to indicate that the battery didn’t get into its slot properly, which should not happen if the design of the case and the battery slot was good enough. Well, now that I’ve found out what was the cause, I only need to charge twice a week or so. I’m glad I didn’t buy a replacement battery.