I am sorry but the design is very bad.
There is no reason for any company to deviate from the standard lithium battery design.
Standards should be followed closely. The door in your house is a standard size. Hard drives come in standard physical sizes.
Imagine a world where ever manufacturer did whatever they wanted.
It would be as much of a disaster as this light is.
The fact that you cant use a desktop charger is a huge negative.
The fact that you don’t have use of the light for 5 hrs while its charging is not acceptable.
The fact that you don’t have “choices” in battery type is not acceptable.
Olight is taking us back to the dinosaur age.
Thank you for bringing all this to a public forum so we as consumers and enthusiasts can make better choices.