Personally....
I have 20 lipos from different manufactureres.
- I do not use a charging bag
- I do not store my lipos in a metal container
- I have had two Nimh fires caused from exploding cells.
- I have had zero Lipo fires from exploding cells
- I have had one lipo fire from shorting out on a steering post
I always balance charge my batteries and store them fully charged.
I may be wrong according to some people, but it suits me and I have few problems.