Battery indicator is showing "Service Battery" notification

I upgraded my macbook RAM, but after that when I switched on my MAC it showed my "Service Battery" indicator in battery menu. I installed Battery Health application and it showed following stats.

Its showing my original battery charge is left at 26%. Does that means I need to change my battery and get a new one. My macbook is 15 inch early 2011 model.

Thanks

Your Mac's battery hasn't reached its maximum cycle count, which for your model is 1000 cycles (see Mac notebooks: Determining battery cycle count):

Other factors may decrease battery life, so double-check the battery condition in System Information.app:

1. Open Apple menu>About This Mac>More Info…

2. Press System Report…

3. On the left hand side select Hardware>Power and look for Condition:

   

Article OS X Mountain Lion: Battery conditions lists the possible conditions:

Normal: The battery is functioning normally.

Replace Soon: The battery is functioning normally but holds less charge than it did when it was new.

Replace Now: The battery is functioning normally but holds significantly less charge than it did when it was new. You can continue to use the battery until you replace it without harming your computer.

Service Battery: The battery isn’t functioning normally, and you may or may not notice a change in its behavior or the amount of charge it holds. Take your computer in for service. You can continue to use your battery before it’s checked without harming your computer.