I've read numerous times that a balanced charged lipo is fine for storage. You can also store them half charged, just not empty. A proper lipo never runs completely empty anyways; because if it did, you couldn't charge it again. We've had one lipo blow up on us, but I don't know the cause. It was fairly new, and being used in an AEG at the time. That's the only lipo I've heard of destroying itself in the last two years. Don't get me wrong, I'm sure there has been more; but they aren't the gremlins they used to be. I do know that when it comes to lipos it's important to buy quality, and you'll want a high end reliable charger; not some cheap discount POS.
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BC & YUKON MASTER AV REPRESENTITIVE