In addition to overcharging causing issues I had not realised that physical damage may (will?) cause a lithium battery to catch fire/explore.
Also be aware that standard fire extinguishers are not effective against lithium fires instead a specific lithium battery fire extinguisher is required. Which all makes me wonder about the wisdom of using lithiums in my caravan... and they most certainly would NOT be located under the bed!
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland