What u are seeing about better battery life is just nothing.and there is no way u have a 1500 mah battery in 1230 mah battery size. Its a scam, because 1500 mah batteries are just larger
Yr phone os keeps track of charging cycles. Over time this becomes inaccurate, in fact the inaccuracy may be escalated after every major os upgrade .
The os in the phone also loses track on accurate battery reporting due to the aobve reasons.Tis is why yr stock battery seems to drain faster after a few months.
3 reasons why its not lasting longer than its used to
1) cell degradation
2) inaccurate battery level reporting by phone
3) both
When u pop in a new battery, whether its these cheap china batteries or original ones , the phone sees it as a new battery and the os recalbrates itself. And even though the new battery may be lower capacity, it gives a placebo effect of longer lasting. This is the case if u got china batteries. But i wouldn't trust mugen either. The whole fact is that u are using a new non degraded battery and it's giving a placebo effect when comparing to the older battery. Its the above 3 reasons which makes yr older battery not last longer.
Of cos it can be proven wrong if the replacement battery u got was of higher quality or is better than the original oem version.in this case the battery may be using better high quality cells or has better circuitry
Whats the solution? Charge yr existing old battery in an external standalone charger and do not charge in the phone . Then put it back into then phone and os will recalibate itself.
Another thing u can do is completely deep discharge the battery and keep it unused for a few weeks.
Then full charge it again and the battery will be rejuvenated to original condition.Of course u may need to use another battery to use yr phone .
Due to popular theory say that it keeping it discharged for long periods of time will ruin the battery, this is true for new batteries that have not been charged to 40% but not for one that has been used .
When u first got yr phone, the battery has been dormant for months inside the retail box anyway and this didn't not ruin the battery , did it? Because the is still a 40% charge in it .
As there is still a good amount if charge left in the battery, after a few weeks they completely drain and when u charge again , the battery will be charged to its full potential and the phone will read it properly now and adjust itself accordingly.
