Is there an Android client yet?
If not, how good/bad is the interface on web?

Same goes for any other device with a lithium battery

Yes, no reason to add a new one to make the problem bigger.

Refillable vapes last quite a while at least.

Depends on how much someone uses it but it ends up adding to the already growing battery waste.

And then we have the problem of batteries dying out and having to dispose of them or the whole device.

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