The shell is whether its thickness probably very robust and I think that the phone protection is provided in any case. You get used to quite quickly to the carefree recharging by simply placing it on the charging station - by the way .... Cables and connectors are no longer needed for this purpose - but are essential for PC synchronization.
That would be probably an incentive for Duracell sheath further develop this even Währe possible.
Priced but relatively expensive. therefore 1 star on the brink.