Re: Best way to use battery
It does not bypass the battery - the phone always runs off the battery, and the charger will either charge the battery or start trickle charging if the battery is close to full charge.
Originally Posted by donawalt
Yes, exactly, A battery charge cycle is the amount of charge used to full charge the battery from 0 to 100. If you drain the battery to 75% and charge 4 times (25% each time), that's one charge cycle. Drain the battery to 50% and charge to 100% twice is also one full charge cycle.
Or is it better to think of it as a constant slight drain-recharge activity - so using a phone 12 hours then recharging is the same, from a battery life/cycles used perspective
, as running on battery then recharging at the end of the 12 hours?
The lithium ion batteries in iPhones work best when you give a lot of small charges than a smaller number of large charges, though. As I understand it, your battery would last longest if you regularly charged from 60% and stopped at 80% (because as the battery nears full charge, the cells start to heat, which degrades the battery more).
But, keeping the phone plugged in at 100% really is fine - the phone will stop the charge and start to trickle when it starts dropping again.
Battery University is a great site, and though it deals mostly with laptop batteries, I think it's still relevant to phones. See How to Prolong Lithium-based Batteries - Battery University
A few quotes from that site:
Similar to a mechanical device that wears out faster with heavy use, so also does the depth of discharge (DoD) determine the cycle count. The shorter the discharge (low DoD), the longer the battery will last. If at all possible, avoid full discharges and charge the battery more often between uses. Partial discharge on Li-ion is fine. There is no memory and the battery does not need periodic full discharge cycles to prolong life. The exception may be a periodic calibration of the fuel gauge on a smart battery or intelligent device.
The question is asked, “Should I disconnect my laptop from the power grid when not in use?” Under normal circumstances this should not be necessary because charging stops when the Li-ion battery is full. A topping charge is only applied when the battery voltage drops to a certain level. Most users do not remove the AC power, and this practice is safe.