Methinks the OP had never fully charged his phone before. Hence the longer last battery after charging longer
The battery does not have memory like the old batteries from several years ago ... it does, however, have circuitry (actually a processor for charging) that need to be calibrated.
How to prolong lithium-based batteries
Then maybe you should be ABSOLUTELY CORRECT by discharging your battery, and THEN fully charging it. Otherwise, its NOT being calibrated.
See? Caps are anoying.
I find that not using my phone extends the battery life greatly
seriously though, how can you charge it beyond what it accepts? The phone stops charging when it 'thinks' it's fully charged, no?