Its raining in Knaresborough also (
Here is a link you can read about batteries, the storage isnt the issue, I think the important thing is the balencing when they have self discharged at different rates and you come to recharge them, note sure how critical this actually is though as I suspect the majority of people never balence cells and never have any issues, myself included
http://www.oople.com/forums/showpost...62&postcount=1
and
http://www.powerstream.com/Storage.htm