Apple Macbook Pro A1278 runs very slow on Battery

Apple MacBook Pro 2011 A1278 Running  very slow when it runs on battery .. but works fine when plugged to the charger This problem has been observed in Apple Macbook Pro 13″ 2011 A1278 Models but can be experienced in other models of Macbook Laptops.The problem is not related to Battery but with Logic Board. We have…