Winter Battery Storage - full or empty?

having now taken the powerfull lights I use for winter my commute off my CX do you think its best to store them fully charged or drained over summer, I doubt they'll get used again now till October. Advise appreciated
Cheers
Cheers
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Specialized Roubaix SL3 Expert 2012, Cannondale CAAD5,
Marin Mount Vision (1997), Edinburgh Country tourer, 3 cats!
Have a set of Cateye which run off Ni / cad, left over summer and had real problems getting them recharged once they had fully discharged---needed to `fool` charger into giving them a proper charge as it kept auto switching off after just a few minutes recharging (needed continuous switch on / off 10x to get a full charge)