IPhone 4s

[Achiel]

My Iphone 4s is 2,5 years old
Performance is slow, battery life on moderate/high usage low
Less than 3/4 day. Would a new battery improve performance/battery life?

 

[sunapple]

It will still be slow, but you'll have more time to load apps.

 

[Willo34]

Battery should make a difference. Plus they are not expensive anymore
http://www.ikfix.nl/accu-iphone-4s/nl/product/1269/?CPI=0
Order the battery from ifixit for 20 odd bucks.

 

[Mrbobb]

Run a freeware called iBackupBot. If ur battery has less than 500 cycles, it's unlikely a new batt would improve things.

WIFI sucks less battery than cellular data.

Avoid using location service (GPS ON), close anything that could be using GPS, not just leave them in the background.

 

[Powermax]

Or use coconut battery on your mac, connect your phone and it will tell you the status of your battery. Then you can decide whether it is worth getting a new one.