Thanks for the comments.

(Hmmm, it seems one reason for the many positive reviews of EBL is that, according to some reviews, the seller requested customers to write reviews, and sent them free replacement when they saw a negative review and asked them to revise the review...)

The wrappers of the cheap ebay batteries that I bought have got some torn chip (see picture, toward the top of the batteries). May be caused by dropping on the ground. Is it dangerous? Never had this happen to my previous cheap batteries (these will be the last cheap generic ones I'll ever buy).

P.S. While I'm browsing for 18650 batteries, most of them say "high drain". I suppose for flashlights used as my headlight, low-drain is desirable in order for a full charge to last longer? What should I be looking for that is indication of low drain? (I use the Skyray King flashlight with 4x18650. Very bulky and heavy, but very bright and much cheaper than bike-specific headlights)