I am going to answer my own question in case anyone else is having the same problem. I was told by staff that the T1M+ is not like the LS. It must be charged every night. I thought that was very unusual but OK, I'm all in. It's very common that my total survey time for the day will be in the 1-3 hour range. I may use the next day, next week or next month depending on type of engineering project. It's also surprising that my decade old LS continues to hold an 18-20 hour charge and the latest "smart receiver" must be charged after each use. This is not a complaint, just anobservation. I should have asked if this was an unexpected but didn't. Perhaps someone here knows why? I suppose it doesn't really matter why if there is no solution.