add swollen lipo blog post

input/blog/2022/2022_06_21_lipo_swelling.md

@@ -0,0 +1,25 @@
+title: Blog
+post: Close call while charging a LiPo
+description: Swelling ruptured the battery casing
+date: 2022-06-21
+comments: true
+---
+
+Today I had an eye-opening incident while charging a LiPo battery.
+It was an SLS Quantum 4S 1500mAh 65C from [StefansLipoShop](https://www.stefansliposhop.de/), but they no longer seem to sell this exact type.
+
+As usual I charged it using my [iSDT D2 smart charger](https://www.isdt.co/d2.html?lang=en).
+I heard a strange popping noise and was not sure at first what caused it.
+Then I saw this hanging from the charger.
+
+<!--%
+lightgallery([
+    [ "img/swollen_lipo.jpg", "Photo of 'exploded' battery" ],
+])
+%-->
+
+I immediately unplugged it and put it outside on the balcony.
+The cells were noticably hot to the touch.
+If I hadn't noticed anything I think the charger would have happily continued until a more catastrophic failure would have happened.
+
+After building nicer [storage boxes for my batteries](rc_equipment.html#can_storage) I'm now thinking about only charging in a can as well!