No, you can't replace the battery. Ours could no longer be charged after about 1.5 years, so we got a new device.

I used the Pro version for 2.5 years. Then the fresh water supply stopped working.
But as the device makes my work incredibly easy and therefore saves me a lot of time, I then bought the Extreme version (cheaper because of the screen without animation - otherwise just as good).
The battery will hardly be the problem... The Tineco is used once a week for approx. 120m².

Battery cannot be replaced. I have been using the appliance for about 2 years and can still clean the flat (120 square metres) without any problems.

Hello, I don't know that you could replace the battery!
To be on the safe side, you can ask directly on the Tineco site (support), I have been using two of these devices for about 2 years, I haven't noticed any loss of the battery yet