Interesting video.
Hard to tell them apart from appearance and packaging.
Battery life can also be an issue.
I have some 13+ year old, Oregon, 40V batteries, that still hold a charge, although, not as much as when new.
With my Redback 120V batteries, I had over a 50% failure rate; some with only a few charge cycles. If the company / warranty is not there to support it, those can be expensive failures.
Philbert