li-po battery type quadcopter

hi all, I'm a newbie looking to get into this hobby. I have some RC cars using 4000 mAh, 20C, 3C, 2S, 7.4V batteries, and I have a lot of them. I would like to use these same batteries for the quad if I can find one that works. Is here any like this on the market? do I have to build my own? Can...

So i bought a couple of batteries from hobbyking and didn't realise that they had xt-30 connectors. This doesn't suit my current build which has an xt-60 connector on the power lead. I have a few spare xt-60 connectors lying around, would it be safe to swap these over on the xt-30 batteries...

Hi So I am new to RC drones having got a budget toy one as a boys-toy Christmas present. It is nothing special, and not meant to be, however I am really enjoying the use of it. It's branded as a DBPower Hawkeye Quadcopter, but uses UDI 841 parts. Finding parts seems to be an issue on the web...