I tested fitting a hypotheical thicker battery into my clara HD by placing a thin piece of aluminum sheet 0.050" (1.27mm) thick onto the battery and closing up the back cover.
While the cover did fit, with two pieces of metal sheet it did not close. I contemplated that a thicker battery than the Clara's 2.8mm thick battery, such as a 4mm thick battery, would fit in the clara, if I wanted to do a battery upgrade.
However, when batteries are charging they swell slightly in size, and when there isn't sufficient room to expand, bad things happen. The Samsung Galaxy Note 7 recall is clear history lesson that without room for expansion, a battery can explode.
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