Why is my battery capacity 33%?

hey.

i've had macbook pro on 2 years , bought 1 of 2010 models.

i'm sell old 1 when downloaded coconutbattery, saw battery holds lot less charge did when new:



have been doing wrong or low because laptop 2 years old?

if it's i've been doing, don't want make same mistake new one.

thankyou.

 

it's seen lot of use looks of it; did calibrate every few months suggested apple?

 

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