The only minor problem with the 3.7v storage recommendation, is that all batteries experience "self discharge" over time.

If your LiPo's end up getting too low, you've effectively ruined them and the may not be capable of being recharged.

So you have to take into account the amount of time the LiPo will be stored as well.

I've rarely seen more than 50-100mA of self discharge on LiPo 2200mAh+ packs over a 3 month period... which is pretty good.