Looking for batteries for my Holy Stone HS210. I found 1 on Amazon, but they want $9 for it, and i can buy the whole drone w/3 batteries for $25. That doesn't make sense to me. Are there other batteries that will work on this thing? I found some on eBay, but they have the wrong connector. well it seems i need 3 posts before i can post a pic of the battery.. Great !!