how many batters do you have?
I have 5 - good for 250 shots if you are lucky
10 total - 6 originals and 4 third party.
I rarely need more than 6 for a full day. The most I've gone is 8. Charging is IME the real hassle - needing say 4 to be fuily charged and 2 partially charged for the next day while travelling means having to make sure that I don't forget to start the process as soon as I get an opportunuity.
I reckon on 50 to 70 shots per battery.
I have a 1 and a 3 .......... I use the 1, (50mm = 75mm) ...... most of the time, even for panos which I stitch
I acquired a 3 first as an experiment - then snapped up a 1 after liking the 3 - and then a few months later acquired a 2.
I use all for panos. While the 3 was the original choice it's now the 1 and 2 that get most use. I have an L bracket permantly attached to the 2 so it can be mounted on rotating pano head.
ISO - i rarely go above ISO 200 ... so that is also limiting
Likewise. I'll go up to ISO800 for colour only if I have to. 1600 for mono.
But. I find that the cameras have very little shutter vibration so can be handheld or used on a light tripod quite easily. I will hand hold and take multiple shots down to 1/13 to 1/25 - and I often carry a very light tripod. I find that the biggest problem with low light is that Sigma sensors don't handle bright lights in the frame as well as other sensors.
I sometimes use a little Jessops Tecno 20 flash with the 2 and 3. I'm starting to think about getting something more sophisticated to use for occasional fill.
I take fewer shots with the DPMs than with my DSLRs but I also get a lot more keepers. I make up a year book of 80 to 100 pages each year and I've found that the DPMs dominate - about 80% of the shots I put in it are from the DPMs.
So in my case the DPMs are the general use cameras now and it's the DSLRs that get carried for specific purposes.