Most batteries come with instructions that say roughly the same thing...
Store in a dry place between 5 and 30 deg C. Do not allow to sit below 0 deg C (outside in the shed in the winter!) and never use above 40 deg C.
Store between 3.2v and 3.8v per cell, not fully charged. If stored for more than 6 weeks, cycle once and put back into storage. Like Wassy I race them and then store them, and it works fine.
Store in a lipo sack or tin, not in the car or loose in a tool box.
As mentioned above, the issues with faults developing during storage seem to have reduced. Most of the current problems are with cheap packs bought from overseas. Apart from some rogue SMCs a while back, I've not heard of any fellow racers having a problem with the good brands - Orion, SMC, LRP, Nosram, Reedy, etc. - so it seems worth investing in good packs, and avoiding anything you get from the Far East directly or through flEbay. HTH
