Hi, I am in the UK and one of my Mavic Pro Batteries seems to have overheated whilst charging overnight and the base is now swollen do it wont git in the drone. It is lighting up and showing a full charge however. I thought I would therefore get a spare battery, but it appears that DJI have discontinued this support for the 1st gen Mavic Pro. I then did a google search and replacement batteries appear to be as rare as hen's teeth, the few places that might have supplied them appear to be exorbitantly priced, or out of stock. I saw a Chinese site named Grandodo.com, but web reports them as a scam site. Is there a reliable and reasonably priced source of these batteries that anyone knows of please?