I think too many people are overthinking too many things nowadays.
I bought some nice looking/fitting Zoomies yrs ago 18650.
Self charging socket in the side of.
One in each car.
Every “whenever”” I remember them I stick the dash charger into them for a coupla days.
One was on for around 2 months. LG Laptop pulls. 22600.
Never missed a beat, they still reading 3.6.(Whoops 3.9 - 4.1v on multi,)
I keep 98% of my torches in area of computer desk. Go through all my installed battery’s every coupla months and recharge.
Come to think of it. ALL my lights with battery installed. Apart from a coupla AA/AAA sized that don’t allow rechargables. Have Li-Ion and Li-Po installed…
All controllers, mouse etc run Duracel Ultra.
Climate. warm to Hot mostly. Queensland Sub Tropics. High Humidity (some say. I don’t notice )
Our winter means a light cover over a sheet in bed. for maybe 5 to 7 weeks (Intermittently) of the yr.