nager dual atty question?

[deltas4]

ok someone i know asked me about the markings on dual coil kanger attys below the ohm rating he says if they say 5L he gets a week out of them and if they say 4K they last 2 days i have seen the 2 codes but what they mean i dont know i just wonderd if anyone out there knows the answer

 

[93gc40]

Probably a MFG location code or something like that.
None of the Kanger coils I have are marked at all.. But then all of the KANGER Kanger dual coils I have are a year old.
A mini PT3 clearo is my backup atty.
Started buying wire and parts for the coils from Lightning Vapes after about 10 factory coils. Then building my own, I do Kanger duals as a single vertical coil. I get better Vapor and flavor and none of the leak and gurgle issues of the factory coil. I use 29 and 30 wire and build at 1.8-2.2ohms. And when they get dirty, I just pluck the cotton, quick burn and stuff in new cotton. After a couple weeks or so put in a "NEW" head, old one goes in rebuild pile. Wife uses a single coil Protank, I build her coils the same way, when I build coils for her.. Rare thing, as she prefers fresh Factory coils. IDK, I quit arguing small stuff, 30 years ago.