Bought product online first of august last year. I used it a few times before the season was over, and stored it indoors, following all precautions to avoid killing the batteries. Come spring, one battery wouldn't chage at all, called and getting another one sent to me via warranty. In the meantime, it's well past the date they said they'd have it out to me by, and now the other battery takes a crap on me. WTF? This is a LITIUM ION battery. These things last for years, or are supposed to, at least. Reading online here I see I am far from the only person experiencing battery issues. I've placed a call to have another one sent out to me...had to leave a message as I was 90th in line. Hopefully the next set will work, whenever they get here. If it breaks again, I'll rebuild the battery packs myself, but I think I'd recommend you stay away from this product. Way too many similar complaints for it to be a mere coincidence.