Full injection molded cases are the way to go. Lithium polymers cells are very suceptable to mechanical abuse, even running your fingernail over the metal foil can create an abnormal resistive path within the cell which can degrade it's performance. The case would not help you if all hell broke loose within the cell, but it will help protect it if your saddle packs trail out of the side of your car like zombie entrails following a shunt!
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