I know some batteries don't like deep discharge, like Lead-Acid and LiPo, so I guess storing them will mean having to charge them every now and then. The question is, how often do you need to top them off when they are in storage?

What about NiCD and NiMH? Do you need to store them at full charge and top them off every now and then as well, or it doesn't matter?

I use NiCd, and NiMH batteries, and normally just charge them as needed. I use the wall-wart to do this overnight. My batteries really don't ever get deeply discharged though.

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.

Cycle nicads often and store them fully disharged. Nickles, cycle a few times and store them at 40% cap. That may be a little anal for planes but for cars thats the norm.