P4 dropped from the sky

I have two original batteries bought with the P4P (now more than two years old). Last month I bought the third original one.
With the last one I can easily do over 20 min flight to 30% left. With the first two the flight time is at least 2 min shorter but I think that is normal. Is it?
Yes, normal.
 
It is recommended that if you do not use your battery that it be charged and discharged every three months.It adds unused charges to the battery but will extend the life and prevent premature failure. That only shows up as two additional charges per year to save the battery.

Thank you KO, since Im storing that bats at around 50% charge I should charge them up to 100% then discharge them to 50% again?
Or should go down to lets say 10% and charge them up to 50%

Thanks!
 
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