Good lithium batteries are rated at 500 full discharge cycles.  If you charge 
them at 50% you should get 1000 cycles.  Like all batteries heat will shorten 
their life.  Fortunately they have builtin circuitry to keep them from being 
overcharged or over discharged as well as keeping them operating in a manner to 
prolong their lives.  That is why they carry one year warranty at most  
Batteries with shorter warranty periods may last as long but their usually have 
been some shortcuts in manufacturing to keep prices down.

Tony
 .


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of 
Gordon
Sent: Friday, August 19, 2016 9:55 PM
To: [email protected]
Subject: Re: iPhone battery cycles

I read where iPhones are supposed to last for around three years. Some will 
probably last longer and less than that, but that's the average. 
I've also read that batteries will charge between 900 and 1200 times. 
Not sure exactly when they would start to lose their strength, but it probably 
has a lot to do with how much stress the battery has been under and how much 
it's been subjected to heat. I know the Nexus 6 used to get really hot when 
watching videos and stuff like that. But the Nexus 6P doesn't seem to get near 
as hot. I personally think that the larger the screen, the more warmth it's 
going to generate and put more stress on that battery. My iPhone SE never gets 
hot unless I'm doing a software update. But even then it doesn't get hot that 
long.


On 8/19/2016 9:40 PM, Mary Otten wrote:
> I wonder how many battery cycles and iPhone is supposed to be able to have 
> before it starts losing significant amounts of staying power.
> Mary
>
>
> Sent from my iPhone
>

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