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I've been comparing weight respective to the reading surface, with 6" as a base (basically, by multiplying by 6 squared and dividing by the diagonal squared of each device):
Glo HD = 180 gr
Aura H2o = 181 gr
Aura H2o edition 2 = 161 gr
Aura One = 136 gr.
I get that the One got a smaller battery (hence a shorter reading autonomy) to reduce weight, with a very effective result, but I understood the edition 2 had a shorter reading autonomy, so deduced a smaller battery too. If it is true (very little information so far), the weight reduction is much less impressive.
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