MBP Battery and time remaining

[JamesP.]

MBP late 2011, 15"

I have had it over 6months and have got great battery from it after full charge.

The original charger broke 1month ago.

Laptop and charger was bought in New York. The replacement charger was bought in Ireland, Magsafe 85w.

I have charged it to 100%, let it go down to 0, and rest 5hrs, and recharged it back to 100%.

Now on full 100% not plugged in it says I only get 2hrs 15minutes from it, and the percentage s dropping alot faster than it ever did.


cycles 377
health 96 %

Is there any reason how this battery life has become so poor so suddenly?
And when do you replace a battery or any other tips?

 

[squeeks]

download this free app and check to see the mwh current compared to original

http://itunes.apple.com/us/app/battery-health/id490192174?mt=12

also check activity monitor and see if anything is using high ammt of resources, my dock was using 108% cpu for some reason the other night and it was cutting my fully charged battery from 6hrs to about 2.5

 

[JamesP.]

download this free app and check to see the mwh current compared to original

http://itunes.apple.com/us/app/battery-health/id490192174?mt=12

also check activity monitor and see if anything is using high ammt of resources, my dock was using 108% cpu for some reason the other night and it was cutting my fully charged battery from 6hrs to about 2.5

Current mwh = 6640mwh
Original is = 6900mwh

The highest in Activity Monitor is
windowserver : Its going between 6 and 15% of cpu
Firefox is also on between 6 and 13%