Originally Posted by TAZ2041

As you already found out, it’s nearly impossible with regular solder. I had this same dilemma a couple months ago and asked at my local hobby shop, luckily the guy next to me explained I needed flux that works on aluminum. Right at the hobby shop he pulled out his phone and pulled up what I needed on eBay and claimed it worked great. Its a Russian brand. I was doubtful but it works great! Doesn’t take much heat. I don’t know how to post the eBay link but if you pm me I’ll try and send it to you or you can search “Flux for low-temperature soldering of aluminum.Made in Russia. It has a blue label. I tore an aluminum can and did a couple quick test to get used to it but it’s a low temp flux so you don’t have to worry about putting a bunch of heat into a lipo