I also purchased the 3800 one. Its a great buy on Ebay, I think I paid like 20 bucks. I just drained it completely about 3 or 4 times and now is in good sync with the battery monitor. I went from about 3 to 4 hours max on calls to about 7 - 10 hrs now with every thing turned on. I tried the new back first with out the foil and after about a month moved the foil from the old back to the new one. I could not tell any signal diffrence at all. Just heat up the old foil with a hair dryer for a few min and it easly pull out without ripping.
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