I have a charging hub for my three P4  batteries and it works normally for full charging but when I select storage mode each slot blinks blue and all three batteries seem to be active.  Is this normal or is there a fault?
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Thanks!  

when in storage mode the hub will discharge the batteries to 50%, and the led light will be blue

Battery charging hub manual, as with all other manuals can be found here

http://www.dji.com/product/phantom-4/info#downloads

Heebus Posted at 2016-8-10 20:25
when in storage mode the hub will discharge the batteries to 50%, and the led light will be blue

Ba ...

RTFM is good advice.

MarcoX5 Posted at 2016-8-10 21:12
RTFM is good advice.

it cant hurt, but it doesnt hurt to help either, I hope you found what you were looking for... happy flying