The Flytech Dragonfly was one of the most innovative flying toys when it came out in 2007. It was the first radio-controlled ornithopter mass-produced for the general public. Sadly it is no longer available for purchase. To add insult to injury, there has been nothing in the market for ten years that delivers remotely the same level of giddy fun for the money. Some recent event reminded me of the Dragonfly from WowWee, so I went through boxes in my basement to find the two units I bought in 2007.
Unfortunately their tiny lipo batteries have since gone bust. With help from ancient posts on rcgroups.com, I managed to resurrect one of my dragonflies with a new setup. It allows me to reuse abandoned lipos from my Blade Nano QX which I have aplenty. Suddenly I no longer need to wait for 20 minutes between flying sessions to charge the built-in battery. I can now effectively fly it non-stop by plugging in replaceable batteries.