In the 'States, there is a legal doctrine (I'm a CPA, not a lawyer,
so forgive me if I miss some of the fine points) called something
along the lines of "suitability for purpose." If a vendor or
manufacturer claims a product is suitable for a particular purpose --
say, by advertising a particular battery pack as being appropriate
for a particular radio -- then they have a RESPONSIBILITY to ensure
that the product NOT ONLY won't cause harm, but that it is, in fact,
capable of appropriately performing its intended function. And they
are legally liable if it isn't.
Off topic. In English law, it is "Fitness for purpose"
Ken Ashcroft
