Is Repairs Universe a trustworthy site?

I am repairing a Nexus 6 for a friend and figured I would replace the aging battery as well. I contacted Motorola and Google for two painful hours only to be told there is no way they can get me an OEM battery. I have bought "OEM" batteries on eBay in the past and quickly learned that there are more low quality fakes than legitimate OEM batteries there. I came across the site "Repairs Universe" which seems legitimate. They claim to have only OEM parts, and reviews from various sites were mostly good. Some sites praising Repairs Universe, a few slamming it. I placed an order for the battery and received it today. The battery is shaped the same, though the writing on it is completely different and basically generic (model number, caution information, mAh) and lacking any kind of branding. I called Repairs Universe only to get a message about it being faster to contact them online, and then an eventual beep. It was a voicemail! I called again later and actually got a person. He said that all of their products are "OEM compliant" not OEM. He told me this just means it has the same specifications as the original part. This seems obvious to me, as anything would be compliant so long as its the same shape and size.
Obviously, I'm confused. I'm not sure if this is a good, honest company or not. Mainly, I'm worried that my battery could be a knock-off and catch fire or swell up. I can't find it anywhere else however so this is my only option aside from just using the aging original battery. The company does offer a 30 day guarantee, but only for the battery; if it explodes and takes the phone and my friend's hand out with it, they'll refund me 22 bucks...if it happens within the first 30 days.
Does anyone have any experience with this site, specifically, their batteries? I'm not looking for other sites (not yet, only once we figure out what the general consenses of Repairs Universe is.)

Thank you!!

from xda-developers http://ift.tt/2a9Ck8I
via IFTTT