The LiPo batteries we used do not like to be stored fully charged or fully discharged. (Technically they should never be fully discharged as it can damage the cells.) They like to be stored at a voltage in the middle.
The charger we sent out has a LiPo Storage setting that you should use. If it is too low it will charge it. If it is too high it will discharge it. The storage cycles on my batteries have been stopping at 11.40 V.