anon(5719825)
Retired Moderator
- Feb 21, 2013
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Read Battery University - How to Prolong Lithium-based Batteries. If you study the chart (second figure, the first is a graph), you'll see that you'll get the longest life from a lithium battery by charging it at the 50% point. (Charging at anywhere from 40% to 55% won't change the lifetime much.)
Letting it run down to 5% regularly? Buy stock in a battery company. It may last a little more than 6 months, but I wouldn't count on it.
If you need more capacity than 50% between charges gives you, buy a second battery and swap them when the one in the phone drops to about 45%. Two Anker batteries (they're good) and a charger to charge both at once (one in the phone, one out) will cost you $25.
I'll keep on running mine down to 5-10%. Been doing that for years and have never had to replace a battery. My iPhone 5S is over a year old now and it still lasts for nearly two days on one charge. My old iPhone 3GS still lasts for a full day. My two year old Nexus 4 still lasts for a day.
I see no reason not to let it get down to 5-10% before charging.