Confusion about accelerometers

From my understanding an object at rest should be almost 0 m/s2. Why does my Bangle.js 2 report a minimum acceleration of 1 m/s2 then? Here's a reading while it's still:

{ x: -0.02648925781, y: 0.080078125, z: -1.01220703125, mag: 1.01571514756, diff: 0.00561523437 }

I've been spending a while asking GPT and Googling to no avail. Is this accelerometer broken? Is this intended behavior? What's going on?