Interesting. You say the InReach SE uses an internal, rechargeable battery, *NOT* AAs. I consider this a giant "minus" for a piece of gear that I might depend on for safety. I can carry a spare set of Lithium AAs or AAAs, but what the heck do you do on the side of the mountain if your rechargeable battery drains? This is especially problematic with the InReach Explorer if you are using your "emergency messenger" as a GPS navigation device. I've had both my GPS and my InReach run their batteries out while in the backcountry (at different times). Being able to simply pop in a spare set makes me a lot happier.
Even though I'm an InReach user, I'd have to say that this is ANOTHER reason to choose the SPOT Satellite Messenger (AAAs) or SPOT Gen3 over the new InReach devices (the weight difference, and the 2:1 cost ratio, especially if you don't care about the battery-draining "tracking" feature, are the primary reasons).
Its very easy to keep a small light USB power pack in a plastic bag in your pack, even one which uses lithium AA cells. http://www.verbatim.com/article/compatibility-charts/
Even if you keep it turned on for your whole trip it lasts 4-5 days. If I read the data sheet correctly, that includes sending your position to a satellite every 10 minutes automatically. Personally, I keep mine off except to check for any incoming messages once in a while, and to send a self-test message when I start in an area with no coverage.
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