Had four swollen bats. They are functioning very well, but the fit on the drone was not perfect anymore (had to do some preassure to "click")

*Four bats* - too much investment to change all.

With a litthe needle, I punctured the back of they.

Had some preassure out. Flat back again.

All working good.

Hi, thank you for reaching out. We're glad that you already manage to resolve the error's on your batteries. Just a friendly reminder, we don't recommend using a swollen battery since it might caused a problem on your drone when in flight. We highly recommend purchasing a new battery if the battery that you are using is already swollen to avoid any possible problems. Thank you for your understanding and support!

Swollen lithium batteries are a bad situation.  The trapped gas can ignite causing a fire during charging or operation.  If they do ignite, they put on quite a show and could easily destroy your drone or burn your house down.  I would use them with great caution.  Maybe toss them and buy new.  

You really pierced a swollen lithium battery? You understand that they will react with air if it gets inside the cell. Especially if it has charge in it. Wow. Cant wait for the future posts on this one.

Malakai_UK Posted at 11-26 03:47
You really pierced a swollen lithium battery? You understand that they will react with air if it gets inside the cell. Especially if it has charge in it. Wow. Cant wait for the future posts on this one.

Yup.... next post will be "DJI batteries suck. Exploded during charging."

Classic case of total novices getting into something without bothering to educate themselves.

Indeed, I believe a lot of the problems reported on the MM may be due to this same thing. People with absolutely no RC flying experience, getting the MM and wanting to fly straight away. And then of course, they want to see how high and how far it can go. And all this without a proper understanding of the functioning of the equipment or reading of the user manual.

Oh well..... I hope the OP doesn't experience anything bad with his punctured batteries.

Ok......'nuff of my early morning rant.

Happy Turkey Week!!

Please put them outside where there is nothing flammable,  these go up big time,  havent you seen the mess even a tiny iPhone battery can make.

Change the batteries in your smoke alarms around the house........