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Message: <blockquote data-quote="Binastro" data-source="post: 3489762" data-attributes="member: 111403">The problem was that there were instances of mixed charge lithium AAs.I cannot remember the details, but maybe a fully charged AA could drain into a lesser charged or vice versa and potentially catch fire.I am not sure if this is correct, but it was a safety issue.I'll try to look up the instruction book if I can find it for the 10x30  Mk II, and if it says the reason.All older models are fine and their instruction books recommend lithium, particularly when cold.Don't forget lithium batteries destroyed a Boeing Dreamliner, I think. Luckily on the ground.  And many laptops and phones have spontaneously combusted. Lithium burns nicely I think if it is given a chance.Some phones are banned on aircraft and Royal Mail will not deliver lithium batteries any more in normal post at least.Carriers have to mark the parcels 'Lithium batteries'.I got some supposedly good quality lithium batteries for my laptop as the 4 cell batteries are no longer made by the laptop maker.Complete junk. Chinese of course, and useless after a few months.I wonder whether lithium battery electric cars can burst into flame.Some houses have been lost due to laptops exploding.I don't know whether lithium AAs have the same chemistry as lithium ion laptop batteries.</blockquote>