SOLVED: Switch battery connector on the battery itself (A1321) - MacBook Pro 15" Unibody Mid 2010 - iFixit
![Amazon.com: TREE.NB A1185 Battery Compatible with Apple MacBook 13" A1181 X451 MA566 MA561 MA254 MB402 Ma254b/a Mb062x/a, Color White : Electronics Amazon.com: TREE.NB A1185 Battery Compatible with Apple MacBook 13" A1181 X451 MA566 MA561 MA254 MB402 Ma254b/a Mb062x/a, Color White : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/51XTHYcsJML.jpg)
Amazon.com: TREE.NB A1185 Battery Compatible with Apple MacBook 13" A1181 X451 MA566 MA561 MA254 MB402 Ma254b/a Mb062x/a, Color White : Electronics
![Amazon.com: TREE.NB A1185 Battery Compatible with Apple MacBook 13" A1181 X451 MA566 MA561 MA254 MB402 Ma254b/a Mb062x/a, Color White : Electronics Amazon.com: TREE.NB A1185 Battery Compatible with Apple MacBook 13" A1181 X451 MA566 MA561 MA254 MB402 Ma254b/a Mb062x/a, Color White : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/617XMrSw1oL.jpg)