This thing apparently can not storage charge batteries. That should be very clearly called out in the description. Storage charging is basic lipo maintenance and the complete inability to do so makes this thing pretty dumb. Glad I bought it as a secondary charger and not my primary or I would be even more angry about the purchase. extremely dissapointed with my purchase and wishing I had just gotten a second M6D instead. Why ISDT would even make a product like this is beyond me. Based on how unclear they are in making this huge gap in fucntionality obvious its pretty clear to me that they were trying to cut corners & pull one over on the customer to do so. I wont be buying any more ISDT stuff with this kind of practice.