FYI.... slightly relevent.
I have an R4 (not a R44). I went to a show last night, recorded for 3+ hours on a 5400mah DVD player battery. When I got home it has "1 LED left" (out of 3). This morning I plugged that into my computer to copy some files over, running off that same battery with 1 LED left. I got the files copying, which probably took about 10 minutes... forgot about it, went to work, and the battery died mid day of course.
Since my computer happens to be linux, I can see in the log files...
- Plugged in R4 with battery with 1LED left at 7:30am, copied some files, assume copy was done by 8am.
- R4 was left idling. Wasn't recording, or phantom on, but the hard drive was spinning I presume, and the screen was lit up brightly.
- R4 USB connection dropped out at 2:08pm
So that's 6.5hours of idle time after the battery read "1 LED left". I guess I always thought that was like driving around with you gas guage on an 1/8 of a tank, but it's probably more like 1/2 a tank. But, I'm not going to take chances I don't think.