glad you want to learn to be safe
read to get educated
Lithium-ion battery safety 101
ask educated questions after reading
tell us what light you plan to use Unprotected cells in
Determine if the light you want to use Unprotected Cells in, has built in OverDischargeProtection
Determine if the light you want to use Unprotected Cells in, has a built in Battery Level indicator.
stay away from multi battery lights
Keep UnProtected Batteries away from lights with NoBuiltIn OverDischargeProtection
IF you are going to use LiIon, obtain a device capable of telling you the battery voltage, so you can avoid overdischarging.
If you use Turbo, and it stops working, dont turn it on again until you recharge the battery. Do not fire turbo over and over again, that is a good way to get into trouble.
The danger of LiIon is that IF they have been overdischarged, they Might start a fire during recharging.
Put charging batteries in a fireproof location, and do not leave unattended, in case they start to get Hot and Vent with Fire…