totally unrelated, but I'm doubtful that pressure changes have any impact whatsoever on li-ion batteries. The materials in a battery expand by 13.4% between di

totally unrelated, but I'm doubtful that pressure changes have any impact whatsoever on li-ion batteries. The materials in a battery expand by 13.4% between discharged and charged, and the PTC (safety disconnect) goes off at 145 psi. The can itself takes thousands of psi before it blows. The minor pressure difference at altitude shouldn't be able to distort the can enough to mess with the materials inside. This doesn't hold for things like pouch cells, which can and have been affected by altitude changes (leading to problems in airplane batteries). Standardized cylindrical cells like those in a laptop should be fine.