tempo
(tempo)
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The most often mentioned brand in this 2019 thread is WAHL oic. I watched several disassembly videos of the popular pro-grade cordless WAHL clippers (cordless Senior; cordless Magic Clip; cordless Sterling 4; cordless Designer; cordless 1919) and for the love of of god i cannot see a notable difference in the interior design/construction/engineering! The cordless WAHL's seem to be constructed the same: easily detachable 18650 battery with included charging circuit PCB, powerful rotary motor, very small simple/primitive main PCB, several big steel screws, plastic female threads.
Maybe the main difference between the 5 cordless models is the motor power (current draw), battery capacity (they all have 2200mAh batteries afaik), OOTB blade type, plastic color/finish, included accessories? The cordless 1919 is said to be a metal clipper (with machined metal female threads, really?).
WAHL has a fun product selector, but even after going thru the selection process, one ends up with a whole bunch of alternatives which i find confusing and annoying. I don't like companies with huge catalogs of similar models, turns me off 
The other clipper manufacturers have a much smaller catalog which makes it easier to pick for example a cordless ANDIS clipper.
WAHL is the OLIGHT in the barber's world, dat true?