Hi guys!
Do you have any picture of a bloated / swollen DJI Spark Battery? Yours or not doesn't matter. I've search google, but I can only see bloated / swollen batteries for Mavic and Phantom.
Hi, if your battery become bloated or swollen, I would not recommend you continue to use it. Please contact our support and start a case when the batteries are under warranty: http://www.dji.com/support Thanks for your support.