For longer bike rides, I usually have my warbiking equipment installed on the bike.
The Kismet server runs on a RasPi3. A smartphone is used for navigation and as a GUI for the RasPi3. Smartphone and RasPi3 communicate via USB tethering - as a side effect, the smartphone is constantly charged.
And this has become more of a problem on warm days, because the smartphone is in a weatherproof holder and -thereby- not sufficiently cooled.
Now, with my new thing, I am hopeful that the smartphone will no longer report battery overheating messages.
UPDATE: Yesterday, the part has proven its effectiveness. Although the phone has switched off again due to overheating, but that happened during a break of half an hour.
We sat in the shadow - but the bike was in the blazing sun .... and thus lacked the cooling airstream.
In the future, I'll probably have to pull out the tethering cable when we take a break.
printed in PLA+, 220°C / 65°C, shell thickness=1mm
The parts can be connected with gentle force (without glue).