When setting up AIR and SKY, take care to insert the batteries in the correct orientation. And, we strongly recommend using Energizer Ultimate Lithium batteries – they perform much better in temperature fluctuations (hint: great for outdoor weather stations).
Detailed battery instructions here: got.wf/swsbatteries
For SKY (note the orientation is different than AIR!!):
Failure to insert batteries in the correct orientation will cause a short circuit and the batteries will overheat causing damage to the device. Don’t be THAT GUY.