I only have 23 charges on my three batteries, and all three show 3 solid and 1 blinking led when I do the hold button test. So out of the three batteries I did a test on two of them, and discharge them down to 4%. Then I recharged those two batteries and tried the same hold the button test, same 3 solid 1 blinking. So deep cycle on the two batteries did not restore back to 4 solid LEDs, which I used to get. Will try the same deep cycle on my thrid battery, but I don't expect to see 4 LEDs..
What are the actual battery voltages as per DJI Go app?
Something isn't right as you may well know what are your cell voltages for your batteries full then at say 10%?
Also I found out by accident that deep cycling my batteries below the 8% DJI used to state does weird things to my P3P smart batteries!
I took my 4 batteries down to 3-4% and they where wonky afterwards. In all cases it reduced my subsequent flight times, on one of them I only got 10 minutes out of a flight! Was getting about 15 min out of the other 3 on thier first flights after the deep cycle. After 3 more normal charges from 10% (I ran them down to 10%) the flight time is pretty much back to normal and all the batteries reach 98-100% after charging and my flight times are normal around 20 min.