Avy beacons: All Alkalines all the time
This is just a reminder to always use Alkaline batteries in your transceiver. No lithium and no rechargeable batteries. They don't work or have a rapid fall off in power output in the case of rechargeable batteries.
Here is an article regarding the matter.
Lithium Batteries and Avalanche Beacons
I am pretty sure our seasoned vets know this, but for the n00bs getting into backcountry riding, this is important stuff to get right.