@kohsamui100 - I'm not sure what your budget is, but if you're in California or another state where Apple has to keep service parts for products <7 years old, take it to an Apple Store or another authorized Apple Repair Center. You'll get a new 90 warranty on the battery, have it installed by a professional, and it will be oem. If you search online, it's about $130 for a new battery installed at an Apple Store.