Who is the battery manufacturer for MBP unibody 2010?

Hello.

I've seen various replacement batteries for the mbp unibody online. On chinese websites, ebay etc. Not from apple though. There was also possible to buy a battery here earlier but its out of stock.

I wonder. Who manufactures the original battery in the computer? Is it Apple? And what about the replacement ones (the ones you can buy here for example)? Are they from the same manufacturer? How do you know which batteries that you can trust have good quality?