I found the following information that should help you resolve the issue:
Once you have fully drained the battery, when you plug in the MacBook, MacBook Air, or MacBook Pro's power cord and start the computer up, you may see an X over the battery icon in the menu bar. If you see this, allow the battery up to five minutes to come out of its low power mode and begin accepting a charge again. If your battery still is not recognized by the computer—if it still has an X over the icon—after five minutes, you may want to reseat the battery on your MacBook or MacBook Pro (applicable only to models with removable batteries). If the battery still isn't recognized after reseating, try resetting the SMC. If the battery is not recognized after those steps please contact AppleCare for further assistance.
Thanks for the reply Delgadoh! appreciate it.
Now i'm encountering that, the battery icon doesn't change after a little bit of charging (say, i started to charge from 5% then it's just stopped on 8%) then i checked the side lights of the battery, it keeps on moving up. Then, when i unplugged the charger, the battery icon is still on charging and still on 8% . Then i read that it says "Service Battery" . Do i really need to change it or is there other way to fix this problem?
No problem musixx, thank you for using the Apple Support Community.
Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://expresslane.apple.com/GetproductgroupList.action