Nah.
To ensure the safety of end-users, this Regulation should provide for a limited derogation for portable batteries from the removability and replaceability requirements set for portable batteries concerning appliances that incorporate portable batteries and that are specifically designed to be used, for the majority of the active service of the appliance, in an environment that is regularly subject to splashing water, water streams or water immersion and that are intended to be washable or rinseable.
So watertight is definitely enough of a reason.
Except this is a bullshit exception because not only is it 100% possible to make waterproof devices with replaceable batteries, they have existed for years already. There is absolutely no technical reason for this, and the exception probably only exists because the corporations influenced the legislators to effectively gut the law.
