Appropos of this Upgrade (Migration) Updates I thought it might be useful to give some tips on maximising your battery lifetime. If you change your phone every year, this doesn’t really matter, but if you keep your phone for a couple of years or more, following these tips will help prolong the battery capacity.
Try to charge before it gets below 30% or so - going much below this reduces the battery cycle life, keep doing it and you will throw away up to half of the charge cycles
Even better don’t charge above about 75% - as the voltage on the battery gets higher, tiny imperfections are created and these reduce life by up to 75%. Yes, a battery charged to 75% can achieve 2000 charge cycles, charge it to 100% and you will get around 500 charge cycles.
Charge it as slowly as you can - if you are going to charge it overnight, find the lowest power charger you can. I put mine on an old 5W iphone charger by my bed, cos it’s got 7 or 8 hours to charge so who cares how slowly it does it. If I need to charge in the day I put it on the highest power charger I can find because speed is more important then. The reason for this is that fast charging causes more internal degradation than slow charging.
There’s no need to be obsessive about it, but following these recommendations when you have chance will give you a much healthier battery over time.