Question about Netgear AirCard 810

According to Netgear, the battery for this model is called W-7
https://kb.netgear.com/24865...

This can bought from a variety of places (although they are probably not Netgear OEM, but rather replacements):
AccuSwiss Gmbh:
https://www.accuswiss.ch/product_in...

Subtel:
https://www.subtel.ch/index.php

Battery Upgrade:
https://www.batteryupgrade.ch/shopBrowse...

Plus many more...

Hi, thank you very much. I have bought two batteries already and they are both not functioning. I guess it will be hard to find a original one.