I saw a 2x charger at Best Buy last weekend. It was the first time I've seen this product and knew right away it would be better then our current charger. Not knowing there was a 4x unit I went ahead and bought it hoping I could buy two extra batteries for our other remotes. But I haven't been able to find just the batteries. I wanted to see if anyone had any success finding extra batteries. If not, it looks like I'll have to sell my 2x unit on eBay and get the 4x unit.