iPhone 4S battery replacement without losing iOS 7.1.1

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my iphone 4s getting old now, , battery: 1.000 charge cycles done (986) , max capacity 1197 mah now, instead of original 1430 mah..
worth buying new battery in case? because hear lot of people claiming more placebo, , since ios 7+ never same battery power out of used on ios 5-6.
there way better view/calculation on improvement be?
mean yes max capacity go 1197 mah 1430 mah then, suppose doesn't mean 16% more battery life out of then, or true? :)

oh , replacement itself: thinking of sending apple new battery (price doesn't matter), i'm worried mean getting ios 8.1.2 on it.. right? 7.1.1 jailbroken , don't want upgrade @ all, send apple (even if it's battery replacement) means you'll getting new os on it? :(
because if that's case, solution taking third party repair shop who'll , few bucks. again don't know battery come from, somewhere cheap on let's ebay or something... idea of getting replica/non-apple battery scares me: suppose cheap batteries aren't same in quality , have increased risk on overheating?

appreciated, thanks!! :)
 

1197 mah little bit low, not much.
i'd wait little more before changing battery.
 


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