Round two
So with camera indicating fully charged, I headed out this morning for round two. I spent three hours shooting away with no battery problems. 210 shots taken, so looks like I never gave the battery enough of an initial charge.
Only problem I had today is that the lens movement failed a few times. I had a Neewer lens hood attached, and I know it is causing the problem, but I don't quite know how yet. The last time it happened, the hood was pretty jammed on. Once I took it off and left it off for the second half of the session, there were no repeats of the problem. I took a photo or two of a Yellowhammer without the hood, then briefly put the hood back on to take a couple more shots. I have had a look and can't see the difference, so hood stays off unless I get glare problems somewhere.
The problem leaving the hood off gives me is that I wanted it primarily as protection for the exposed lens. I have got a Hoya UV filter, so I think that I might try that as my protector, and see if it changes the camera performance at all.
A few photos from this morning below. Light was variable. All shot in bird watching mode. Only change I've made to the camera is set the NR to low. My plan is to test the camera initially by having it set in one particular mode for each session. Once I've got a grip of the performance in each mode, I may look at adjusting Exposure Compensation.