Are you on the ADV forum ?IF the one that has a reputation for quality AND costs more then it's likely to be better quality. Amazon is your friend for reviews.
You CAN take chances on no name lithium. It MIGHT be okay. I'd rather have something I know has worked for others.
Gene and Neda have been on the road for 4+ years and swear by the XP-3 product.
RideDOT.com - Ride the World! index
so do I
This is a thorough review
Review: Antigravity Micro-Start PPS XP-3 jump starter | Sebastian's Garage
There are a few members on there that will not agree with the reputation.