Leave the LiPo's alone. From what I read, they will be fine with infrequent use. I have a drawer full of batteries in my referigerator. When I need one, I take it out and cycle it a few times and see how it does before flying with it. If it's to old, I just don't use it and get a replacement. Good replacement batteries are much cheaper than a crashed aircraft or possibly paying for damage to property after a crash.

But, of all the battery packs I DO have, I've not yet ran into a problem with any of them. So, most of the advice may be to check them out on a cycler and see how they hold a charge.

CGr.