Don’t received it yet 
still in the mail. I’ve got another two 26650 lights and it is DN70 & DN35 both Imalent, both came with Imalent’s batteries. Anyway I’ve already bought Keeppower IMR26650 6000mAh cos Shockli IMR26650 5500mAh (Test/review of Shockli IMR26650 5500mAh (Black) 2017) is not possible to buy near my home (and last time I’ve bought batteries from banggood it took 3 months to came here!). And in this review (Lumintop ODL20C Flashlight Review – ZeroAir Reviews) author used flat top battery so I predict it will be as good as this Keeppower
Besides I have no experience with 26650 I use normally 18650 (with my lights and e-cig) and here I can help