"Replaceable" means that something or someone can be easily replaced with someone or something else that performs the same function or has the same qualities. Full definition
This is the first time i see a tablet with user replaceable battery, with that being said the design is uninspired and looks hideous compared to the also water resistant sony tablet Z series. (phonearena.com)
For tablets at least, the issue with user replaceable batteries is that it reduces chasis strength as the battery cover can not be an intergral part of the chasis (for rigidity at any rate) and it also adds bulk and weight. (blog.the-ebook-reader.com)
It even comes with replaceable batteries in case your power goes out, so your home won't ever stop being smart. (geekwrapped.com)