The Android OS is usually a large part of what is using battery and I believe that is all the background processes that are running. Keep in mind that all of the percentages shown under Battery are percentages of the total amount of battery that has been used not direct percentages of the battery itself.
As much of a pain as the FDR is, it might ultimately be the road you need to go down in order to truly fix this. Nothing beats the performance of a clean install. Also, battery life seems to improve after a couple of days as if the ICS OS needs to settle in. A couple of reboots and you could try wiping the cache partition in recovery again. That doesn't hurt anything.
May the Schwartz be with you.
Sometimes the battery monitor widget can take a little bit to give you an accurate reading. If you are running an app and then shut it off, it takes 10-15 minutes to idle down to its idle mA usage. I find I get most accurate readings if I set my phone down for a couple hours and then check history in battery monitor widget app, it usually evens out at like -23mA. That is it's idle draw with the screen off. I have all my GPS enabled, email sync set to 15 minutes, and still manage to run really light battery usage.
Your battery should last more than 2 years even with heavy use(which I don't think qualifies for you since you said you get 2 days out of it typically).
Expected ICS late Q3 or Q4(2012). I called it back in February 2012!
Now Expecting JB late Q2 2013. I called it back in October 2012!
Josh is basically right about battery lifespan. Typical manufacturers rate the "end of life" or "end of usable life" of a battery as when it will only hold a charge that is 80% of original capacity. For most, that means the battery will take about 500 full charge cycles where a full cycle is the consumption of 100% of a charge and 100% charge replenishment.
For example, if you use the phone from a full charge (100%) to 50%, then charge back to 100% typically every day, you have used 1/2 of a charge cycle. If you do that 2 days in a row, then you will have consumed and charged 50% twice, or 50% + 50% = 100%, or one full charge cycle. For that person, they will get 1,000 days of life from that battery. For someone who uses the phone from a full charge to 15% and then charges to 100% again, they will get about 588 days of lifespan before the battery will only hold 80% charge (500/85% = 588).
Other factors play a role in how long the battery will last including how fast you charge (slower is better), how deeply you discharge (not less than 15% is better), how fully you charge (not more than 80% is better), and how heavily you use it during the discharge portion of the cycle (slower discharge is better than fast).
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oddly enough, my battery seems to have started behaving today. I was using my standard battery last night testing things out and it was still draining like crazy. I grabbed my extended batt and put it in this morning at 7:00 AM. It started with an 80% charge. Its not 4:25 PM and Im at 60%. Thats right back where it was. I was playing around today and Voxer seemed to be acting funny so I uninstalled it, but I dont think that was causing the battery problem as it wasnt showing up on the CPU, battery, or RAM monitors ive been looking at. Im going to give it a few more days to see how it goes before I get crazy and do an FDR.
Upgraded to 246 then 247. Loving that I have no data drops, and processor got a boost to 1.2 GHz. Phone functions better, and ICS is sweet, but battery life has been far less than with 905. I have disabled bloatware, and after a week of waiting to see if ICS would "settle in" and start giving decent battery life, I gave up and tried an FDR. Sadly, it was not a silver bullet, and today I'm at 15% after 8 hours of light use, and very little data. No GPS at all. Any suggestions? I used to get about 14 hours with moderate use, but today is even worse than last week before I did the FDR. Frustrating....
Loving my Bionic again!! Thanks to ICS 247 courtesy of the HoB!!!!