Hoping we could request Xtar to send you their other Xtar batteries (in pairs) so we have an idea how they perform.
So far, I can only order Xtar batteries only if the item has an option to include batteries. And I have ordered a few 14500 (Xtar 800mAh 14500 flat-top) and Xtar 4500mAh 21700. When I ordered Xtar powerbank with 18650 batteries, they didn’t include Xtar-branded 18650s but instead gave (genuine) Samsung 30Q 18650s) — it was not specified what kind of 18650 to be included with the Xtar powerbank when I made the order…).
So right now I’m interested to know how Xtar batteries perform (in particular, I’m getting low AC IR for the Xtar 4200mAh 21700, and they’re about 1mm shorter than other 21700 batteries — making these Xtar 21700 batteries fit properly on the earlier Fireflies PL47 and Fireflies E07 which will dent other longer batteries like the Liitokala Lii-40A 4000mAh 21700 battery due to these batteries being a bit longer)…