Use both hands with the thumbs on the top clip and pointer fingers on the bottom clip. Rotate your hands so the knuckles press on the body/arms immediately next to the battery opening. This leverage will 'pry' the battery out with little chance of an 'explosive' release flinging the body and battery in opposite directions.
Very slight puffing - OK
I don't think there has ever been a report, not on here anyway, of a battery coming out in flight - may be wrong.
But I have to repeat that I would never use a swollen battery.
Common causes of battery swelling include:
No LiPo battery should be left for long periods of time, they need periodic attention, charging and discharging.
- Overcharge conditions which accelerate parasitic reactions between the electrodes and electrolyte, with release of heat and gases.
- Poor cell quality and design with low anode to cathode stoichiometric ratios, particulate contamination
- Mechanical damage to electrodes induced either during cell assembly or from the product application
- Excessive temperatures (Do not leave your cell phone inside your car)
- Deep discharge of cell