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Ok charger, good reading of voltage, also can be calibrated from the menu. It has no discharge function. It has no Storage function. You can use it as a power source, and set the minimum input voltage, therefore you can discharge batteries this way. The minimum charge current is 4.15 V, therefore cannot try to storage charge by changing the desired end voltage. As for discharging i personally never use the chargers, and for storage I have other chargers, this is a bonus charging capability. At this price you might be better off buying two Q6 nanos, and you have the added benefits of discharge,storage, aaand if one breaks you still have the other.
There is no discharge function on p10. The storage function is realized through the charge function. There is a function of the power supply unit through channel 1. For the update, you need a usb cable type c. all health and well-being.