The confusing part of the synopsis is how they awkwardly cut it at "no tools"and went on to list “or set of tools that is supplied with the product or spare part, or basic tools”
It’s actually a list of the 3 valid ways to replace a battery under the law:
- With no tools (eg pop off cover)
- With a set of tools that is supplied with the product or spare part (special but included)
- With basic tools (common screwdriver, etc)
So, yes a robust waterproof screwed-in cover should be totally fine.
I didn’t see that either until I read your comment!