Ik charged de Openspot4 pro 100%, led is off. Shut the Openspot off. Next day the power is dropped to 77%. How is het possible that the power go down to 77% when the Openspot is off?
Which firmware version is running on your device? Note that battery percentage is a rough estimate and can be different while the unit is plugged in and unplugged.
Mine does exactly the same. V61 firmware
Normal