Hikelite
(Hikelite)
2
They are almost 2 years old, they need 3 more months to be.
If you read the forum in general you'll see quite some talk about them.
See 2100's discharge tests
They are offered protected by Redilast, Callie Kustoms, 4Greer, Intl-Outdoor.com
Regarding most powerful, 3100mAh is the capacity not the power. They can give currents up to 6A.