Guaranteed to bloat

I'm the "proud" owner of one of Apple's most infamous spare parts: their old, bloatable Macbook battery! Went to the store from where I had purchased the Macbook some six years ago, and they told me that they would have to source for a replacement battery from around the region. I dithered for a while but then decided that it wasn't worth throwing RM490 to buy a new battery with only a three-month warranty. I would interpret this to mean that yes, the replacement battery is guaranteed to bloat again after the three months are up!