SoFlow SO4 2nd Gen Originalbetriebsanleitung Seite 17

The battery lid can be opened by pressing the right turning light button for 3
seconds.
Once the battery compartment is open, pull the battery upwards by the tab (1)
and then pull the battery towards the rear wheel.
Pull the battery upwards and release it from the case.
When you want to close the battery lid, press the right turn light button for 3
seconds to activate the lock. Afterwards push the lid down to close the
compartment.
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