As I understand they are safer and can be charged much quicker.
There will be new & better technology coming all the time for batteries in the years to come, but it'll take a while for them to settle.
Maybe it'll also be a bit like CD vs. MiniDisc etc... the first standard will keep it's ground. And for most RC classes LiPo does indeed "fulfill all needs"...
Heard a rumour a while ago that IBM had developed batteries with 20x the capacity of LiPo... (given the same size)
1:1 cars OTOH really can do good use of even better batteries...
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