I seem to be getting about two days use with the 1750 Seidio. It seems in line with the 1800 Extended battery in my Samsung Saga.
I sync about four calendars including one full Exchange account hourly.
One Gmail account setup on imap hourly.
Friendstream (better than the crappy facebook app)
BT on for the work day (auto on/off 9am-7pm)
wifi on occasionally (because it DOES use less power for data than 3G) but otherwise off when I don't have a wifi connection.
gps on because it is only used when it's used.
live wallpaper seems to only suck 2%
Automatic airplane mode from 12am-6am
Normal phone, email and app usage during the day
Ocassional game and social networking.
HTC Calendar widget doesn't seem to hurt.
No Weather use. I have a window.
Good Verizon signal everywhere.
A little fring and ip cam viewing but not normally.
Those are some pretty impressive stats and good notes Lars. If you have a chance, could you send us the details of your "Settings > About > Battery > Battery Use" screen after say 36 hours of being unplugged? I'm curious to see how the cell standby and phone idle factor in with everything else.
Right now I'm at 76% with 4h47 mins unplugged. OEM battery.
Cell standby 34%
Phone idle 35% (No calls on it this morning)
Camera 13% (about 5 pictures)
Android System 10%
Bluetooth 4% (was streaming music to my stereo in the car for about 20 mins driving to work this morning)
Mediaserver 4% (been listening to MP3's on and off all morning)
Display 3%
I get push email and calendar from an ActiveSync enabled Exchange server.
Gmail emails set to receive as they arrive (no contacts or calendar)
Twitter set to manual updates
HTC Clock/weather set to hourly updates
Bluetooth and GPS typically set to off unless I'm using them but I'm going to try leaving GPS on as it shouldn't use any (much) power unless its being called by an app. Bluetooth seems to use battery even when not in use.
I've been using WiFi more at home lately and it does seem to take much less battery than 3G. Might set that on a timer or location based rule with "SettingProfile" application.
I can honestly say that my usage patterns are DRASTICALLY different now compared to the past few weeks. When I first got the device I couldn't put it down. I think that my usage has normalized and I'm getting some more work done during the day now.
I'm sure that is a huge factor in the battery game.