Anyone found where to order a spare battery for the 950XL?

I've checked everywhere I can think of.

I brought mines from Amazon, a Chinese company but it's working been working since I brought it in March 2017.

Original 3340mAh Nokia Battery BVT4D BV-T4D for Nokia Lumia 950XL in Non-Retail Packaging
 
Earlier this spring, I took the back off my phone only to find that the battery had swelled up and was bulging to the extent that it was difficult to close the back cover. I called the local Microsoft Store from where I originally bought the phone in November of 2015 and they told me that they were no longer selling Microsoft phones or accessories since December of 2016. I explained my problem and that I was scared of buying a third-party battery, given the Samsung Galaxy Note fiasco. The young lady I spoke with said that if I still had the receipt, I should bring back the phone and she would refund what I paid in full. That is what I did, bought a new Samsung Galaxy S7 on sale and pocketed the difference. I really do miss my Windows Phone (I've owned a Lumia 920 as well), but it's apparent that MS has abandoned them.
 
The battery I bought via Amazon is basically NOT working: charges up to 100%, drains very quickly to around 75%, then okay to around 60%, and then the phone shuts down. When I plug it in, the phone turns back on without my pressing the power button and with the battery indicator still at around 60%. Any guesses what's going on? Is it just a crap battery? Do I need to 'train' it somehow?

The battery in question is the one on Amazon from 'Weihang', though the battery itself is branded 'Microsoft'. It was the only one available when I ordered it last week.
 
Mugen Power

Microsoft Lumia 950XL 9300mAh Li-ION Extended Battery Mugen Power | Black & White back cover | Physical Shutter button | 12 Months Factory Warranty

http://www.mugen.co/

Sent from Lumia 950XL
 
(see the attachment)


You can use batteries from other MS\Nokia phones. 950xl currently isn't my primary phone for now, because ms decided to "move ahead" to ios\andoroid and kill their mobile OS (for consumers at least, but international business doesn't need a mobile OS without consumer applications). So I took the battery out of my second dev phone 630DS and attached it to the 950XL today. Will improve battery connection later.
Original battery is completely dead - (see the attachment)
PS: quick charge isn't supported by this battery.
 

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I just ordered a battery from rounded.com and as best I can tell it's an OEM battery. I had previously bought one from Amazon that was very clearly fake, but this one looks identical. In fact, if not for the different manufacturing dates, I wouldn't be able to tell the difference between my new one and my old one. Performance will need to be tested...
 
Aliexpress has batteries for 950XL, and the price is not an issue. Now, I haven't ordered batteries, bc I don't need any (just yet), and cannot tell if they r genuine or not. However, any battery is better than no battery at all.