This battery replacement for Macbook A1322 can replace part numbers 661-5229 & 661-5557. This battery is based on a Lithium Polymer cell which are known to last longer than older type laptop cells and are not subject to memory effects. You can unscrew the old battery and replace with this premium replacement. Please ensure longer battery life by ensuring a full charge and discharge.
Macbook A1322, 661-5229, 661-5557, A1278 (2009 Version)
MacBook Pro 13"
MB991ZP/A Aluminum Unibody
(not compatible with MacBook Pro 13" released after 2012)