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This is an old problem that has been worked on for years and is better these days than when Lithium batteries first came out.
We even had fires on airliners from "backup" Lithium batteries. The Lithium batteries were used because they were so light relative to Ni-Cad or Lead batteries. These batteries could never be charged. There were problems sometimes with severe cabin depressurization because the batteries had a lot of pressure in them.
The Lithium Ion batteries are made for recharging. They work very well because they are light and don't have a memory retention problem like Ni-Cad. There can still be a gas build up and there are vents usually. The charging circuitry is supposed to keep things under control but of course anything can fail.
If there is electricity, you can have over heating and possibly a fire.
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