It's not a meteorological phenomenon.

It's what happens when the battery in my Nano logger decided to swell up.

The case of the nano has been deformed for some time, but I thought it was just sitting in the hot sun on top of the panel causing the case to distort. A few days ago I heard a sharp 'crack' and noticed I could see daylight through the nano on top of the panel. It pulled a screw head through a mounting hole.

When I took the nano apart, the battery was swollen. Into the recycling with that.

Lucky for me I've just started using the nano to provide GPS data to a Kobo Mini. The nano works just fine on external power from the power/serial adapter it came with. I'm running it from a 3C LiPo 1.3Ah battery as used by RC aircraft. Nominally 11.1 volts, but it is over 12v off the charger and is still over 12v after 2 days running the nano.

--
Phil Plane