4s Battery Stops Charging at 100%

Since I got my 4s on Friday it's happened pretty regularly.
I place my phone on my charger at night right before bed. In the morning when I wake I check the phone and it's charged to 100%. If I leave it on the charger though and check back in an hour or two I notice that the battery begins to discharger (or simply that it no longer is being charged.) The last three days when I've taken the phone off the charger the battery has been at 96%, 98% and 92%.
I'm starting to wonder if this is an intended feature meant to stop the phone from being overcharged, a bug with iOS 5 or a defect with my phone. I'm doubting it's the later since I've heard from a few people already who are exepriecning the same issue.

paulcb wrote:
It's not supposed to do that. The device will stop charging when it reaches 100% but it should not go down if still plugged in. Your battery meter may be off... try this... fully discharge (till it shuts off) and then fully recharge (100%) the battery to recalibrate the battery meter.
My observation is that the iPad charger output is reduced at 95 and stopped at 100%, the battery is allowed to discharge from 100 to approx 95% and then power is applied, this is identical to the behavior of a modern Mac portable with a magsafe charger. It's just like any other feedback system, actions taken by the supply (charger) are predicated on the behavior of the load (battery)
I would not be surprised to see the same behaviour on the iPod and iPhone.

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Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
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4s Battery Stops Charging at 100%

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