Source for Good Quality Replacement Batteries?

[LumiaGuy]

Now that my new Lumia 640 is here, my old Lumia 520 is getting demoted to duty as a MP3 Player. Its battery is a little over two years old & getting weak so I'd like to purchase a good quality replacement battery. Real OEM Nokia batteries aren't available from Nokia/Microsoft and everything I've looked at on Amazon has mixed/poor reviews. Anyone know of a Source/Seller/Brand that is worth buying in terms of quality?

 

[LumiaGuy]

43 views and no replies - someone has to have some useful advice as there are lots of crap/inferior aftermarket batteries out there...