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Even if the weight of the cells doesn't change that much, if the new cells aren't as heat tolerant then there might be significantly more weight and space allocated for cooling, meaning you get less cells

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I think that one of the big advantages of tabless batteries is supposed to be that they have a much larger contact area which makes them easier to cool, particularly spirally wound Li-Ion which is going to be hottest near the core.

But this is an area of active research and a fairly complex modeling problem, and I’m no expert.

New cells will heat up less due to lower internal resistance.

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