The additional layer of clear heatshrink on a NiMh cell does nothing other than cosmetically protect the cell, where as the heatshrink on a TP LiPo actually holds the case together. So as Adam has quoted from PW, the case could be bonded together.
Personally speaking, I think this should happen on the TP LiPo's to satisfy the part of the EFRA rule that states
"1. Lithium Polymer (Li-Poly/LiPo) battery packs must have a hard, protective case that completely envelopes the cell(s). The case should be made from ABS or a similar material. The two halves of the case must be factory sealed in a way that any attempt to open the case will destroy the case. The only opening in the case that is allowed, is for the exit of wires."
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