Comparing batteries, just the basics
For whatever reason, a big chunk of YouTube reviewers always gloss over the basics of battery capacities
Im assuming they just read the glossy ads, and report the mAh numbers and then compare those between devices
The issue is that you can't directly compare 2 batteries only on mAh.
Aka a 10,000 mAh vs 5000mAh battery is a meaningless comparison without knowing what voltage each battery is rated at.
Its like saying my car, which goes 80, is faster than your truck which goes 60
First glance, it seems obvious that 80>60
But if it's 80kph vs 60mph (60mph = ~100kph) you see what I mean...
So for batteries, you need to know capacity (mAh) and the voltage.
Combining those 2 together gives you watt hours (wh) which is a single measurement yiu can use to compare batteries
Real life example
Nexdock typically uses 5000 to 5800 mAh, 7.4v batteries
Uperfect typically uses 10800mAh, 3.6v batteries
Almost all ads only ever reference the 10800 number tho
Doing math you get: nexdock 5800mAh x 7.4v = almost 43 wh battery
Uperfect 10800mAh x 3.6 = almost 39 wh
https://www.rapidtables.com/calc/electric/mah-to-wh-calculator.html
Simple calculator to reference
Long and short, when comparing portable monitor batteries, or lapdocks, understand that wh is true measurement of the battery for comparisons