From About iPhone BatteriesA properly maintained iPhone battery is designed to retain up to 80% of its original capacity at 400 full charge and discharge cycles.
From the previously linked article.Thank you for all your replies. I had the phone 1 year in February and I don't think I'm imagining that the battery is far worse than it's ever been, and now I have to avoid playing any type of games to get me through the day with email and calls. Such a shame. And I have another year of the contract to go so don't expect much more for playing games on it.
Are those battery 'apps' rubbish?
Thanks again for replys
Do this, it allows the smart sensors to recalibrate. That may be your only issue. Obviously some degradation with age, but the calibrations tend to drift and a fully drain til device shuts off and long full charge (e.g. overnight) should correct.For proper maintenance of a lithium-based battery, its important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).