Always use a case for safe storage when not in use. Never put in your pocket, purse etc. Keep away from keys, coins and small metallic objects.
It’s good practice to charge batteries on an external charger that is correctly rated for Li-Ion cells. Never leave them charging unattended and they should be removed when fully charged.
Batteries should be periodically inspected for tears and rips. Never use a batterie with a damaged PVC wrap, either recycle the cell or repair immediately.