&gt; And your competitor can build one that&#x27;s a little bit smaller, a little bit lighter, a little bit more beautiful<p>People keep saying this because it&#x27;s the excuse given by companies who do it (and who may have ulterior motives). But is there any technical reason why it should be true? How much &quot;thickness&quot; does a modular battery connector <i>really</i> add?<p>More to the point, it assumes that all customers want exactly the same thing, which is pure bunkum. If all your competitors are solely selling tiny shiny delicate objects that lose 100% of their value upon battery ageing or collision with the ground then there will be some large minority of the market that will stand in line to get something which is 12% heavier because it&#x27;s more modular and durable than that, and you would be able to claim that entire market segment by providing it.