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I do not have any of the applications that you seem to have but my backup dxg in standby mode with 3g off seems to last forever. I top it up every month or two just to make sure.
My regular use dxg (again no extra applications, just stock firmware) get's about 1 hr per day e-book reading (just normal Kindle/amazon books) and I get ~1 week between charges with 3g off.
If I have my 3g wireless turned on and use it's web browser or download a few books (like when I am away on holidays) it can go down ~20-25% per day.
So maybe some of your applications are either very power intensive and maybe draw power even in standby mode, or you are leaving on your 3g. Don't really know?
I guess it could be the battery, esp. if you have routinely let it get down to the critical warning too often. Over-discharging these lithium polymer (or lithium ion) type batteries does reduce their life. I try not to let mine get below ~25% before recharging and so far even my 3 year old dxg battery still seems fine.
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