SterlingTek are known for their aftermarket batteries. I've owned a couple of them and all work fine with no problems. This is an option for those who don't want to shell out $50 for OEM batteries.
Yes, they are well known and have lots of complaints about poor batteries, even though they have tended to be better than the really cheap ones sold on ebay.
The US post office no longer allows you to send any li-on batteries or electronic devices that contain a li-on battery thru international mail. Since they are in a cargo hold, there is no chance for the crew to put out a fire, and the halon extinguishers in the cargo compartment will not necessarily extinguish a li-on battery fire. You really do not want to be on a plane with li-on batteries in someone's luggage.
All those devices with large li-on batteries are going to cause another air disaster, its just a matter of when,, and how bad.
As I noted, even the best batteries fail, but why increase the odds of failure to save a few dollars?