Where can I find original MacBook Pro batteries? I have a 2011 13" MacBook Pro. I have replaced the battery once, replaced the charger two times (because it wore off/tore up). I have replaced the original drive with an SSD and pumped up the RAM so my MacBook runs pretty much like new with Sierra (upgraded).

Now I am not taking chances on off-brand batteries because: 


they can potentially damage/brick my laptop (my replacement battery had swollen after an year).
replaced batteries do not fully hold the charge and have much smaller life times.
because my laptop is showing no sign of slowing down, I would rather replace the battery with the original so I can use it for another 5 years or so.


The problem is I can't find original the MacBook Pro battery for a 2011 laptop. I may visit a store to find out but is there a away I can order an original MacBook Pro 2011 13" battery online?
Apple don't sell batteries as spare parts to customers, and the Unibody MBP's battery is not 'user-serviceable'. Hence the funny tri-cornered screw heads. Anything you find on a third-party retailer's site is likely to be 'grey', even if claimed to be Apple-branded.

(Having said that, I have bought several of such batteries for Unibody MBPs and they have worked well with no problems.)

If you take your MBP to an Apple Store, you should be able to get it replaced, but obviously Apple will charge you 'some money' for this.