Yes it is possible. I saw someone did that. You have to open the back of your iPhone. Most replacement batteries you can buy from eBay or Amazon come with a compatible screw driver.
But judging by your story, I think you need to try a whole cycle charge (drain-full charge-drain) first and see if it's still the same.
Archie
On Apr 14, 2013, at 10:43, chas <chasm@texas.net> wrote:
>
>
> Is it possible to replace the battery on the 4S ? Mine is not holding a good
> charge and it is especially noticeable when I put the phone into a CHARGEIT!
> 2X or even a fresh, new 1900mah RoHS external battery (identical to the
> CHARGE IT!).
>
> If I take it out of the external battery and plug in the 16 ? pin - it will
> charge right up to 100% but with the battery switched on and charging with a
> mini USB, the phone keeps losing power down to about 84%.
>
> Not sure how old the 4S is but I have had it for about 2 yrs.
>
> Help?
>
> thanks
> chas
> Houston, TX
>
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