Batteries aren't always easily replacements, as many phones are now officially not fiddlable with. However YouTube will usually help with the how, and eBay with the new battery.
However I swapped the battery in two phones and either the replacements were a bit duff or it wasn't the battery at fault, as the battery life improved, but not back to Day 1 performance.
may be something to do with teh 180 apps I had installed though, and using the HD screen almost continually at times for hours on end... The new phone seems much better though (and has a larger battery!)
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