Shall I upgrade from iOS 7 to iOS 9.2?

My iPhone 4s runs iOS 7.1.2 and unfortunately, its battery is not the best since when I'm connected to Wi-Fi, browsing the web or anything it tends to go down a little faster than it would without being online. I blame the OS on it. What do you think? Shall I upgrade the the latest version?

You have nothing to lose, and everything to gain!

So, do the Upgrade.

If it upgrades successfully, that may also solve your Battery problem. Or, Apple may replace our Battery under a Factory Recall Program for free…

A 4s is an "old" piece of hardware which may not take well to iOS 9. Works beautifully for me (iPad Air 2 and iPod touch 6 gen), but with a 4s, I'd probably keep the 7.

Perhaps you'd like to upgrade to the coming 4" iPhone due next year, which also is way cheaper then the 6 and 7.

IOS 9.2

4S is many years old now, so your battery could just be wearing out.

Upgrade to win xp

NO DON't UPGRADE! IOS 9.2 will completely slow down your device. I have an iphone 5 on iOS 7 and it runs perfectly while my other friends with iphone 5/4s who have upgraded are always complain how slow it made their device. I even upgraded my ipad 2 and is at a point where it's so annoyingly slow I can't even use it. The cool new features aren't worth how slow it will make your device.

Do it

Thfth

Been running the latest iOS when they come out on my 2 4S models with no problems. I did replace the batteries in both phones though. That really helped with the battery problem.

The iOS won't impact your battery life. It will only be noticed in processor speeds. Age of the device causes battery degradation. A battery only has so many recharges in its life before it becomes useless. This doesn't happen where it is perfect for 10,000 charges and then suddenly dies. It gradually wears out and its charge life shortens.

My old iPhone 3GS needs to be recharged daily and can run down in only a few hours if I'm doing battery intensive things, like on line activities. I'm on iOS 6.1.6, which is the latest mine can use.

My wife's 4S is using iOS 8. Something and has noticed no processor slowdowns when using the programs she has always used. It would only cause a slowdown if you tried to use some of the newer processor intensive apps, that you didn't even have available in iOS 7. She only upgraded because a newer app that she wanted to use had come out that required iOS 8. Her battery life is not as great as originally, but still good enough for what she does.

My rule of thumb is: If it works, don't mess with it. If iOS 7 does everything YOU want, then don't bother upgrading it.