Battery drain during scuba diving

If the case is attached to the user and the user has used the little lanyard inside the case to attach with the mini 2.

But to be sure: you have experience with diving with a mini2 and the dive case?

By the way: What do you think: is a Mini 2 with diving case or, for example, a Nautilus LifeLine the safer solution when diving?

No, but I have messed around with a lot of objects and devices with my hands on the surface and underwater. Including in arctic waters offshore and at night. My flippers are retired, so I don’t know about the best civilian options for diving.

I am not worried about flooding the device at the surface. I am worried about dropping it and losing it while taking it out of the case in rough conditions while wearing thick gloves. The case itself is attached to me with a lanyard.

As for being clear enough in my head, that's not a problem.

If you are just lost, you have time.

If you come to the surface due to a health issue, you may not have time.

Why is your inReach Mini 2 not connected to a lanyard inside the case?

From what I can see there is an attachment point you can use.

https://www.youtube.com/watch?v=fQDCc2qQgLc

All of this discussion of how nradov "should" use the device really isn't the point here.  Seems like really the biggest question is why is it using 15% in an hour.  If it's like he says, it should be using at most 3%, maybe 7% in worst case.  But in my test, I used under 1%.  2nd is if there should be a way to put it into airplane mode where all radio's are turned off, which would largely become Mute if it were properly using under 1% battery / hour.

Also not really for us to question his qualifications or competency.  We know nothing about him other than he dives, and wants a way to be found/rescued as quickly as possibly in case of an emergency.

I fully agree the Mini 2 should be fully functional via irRemote widget, which it currently isn't.  Make it work via muscle memory is easy.  Add it as a Control so button presses are deterministic.  I can send preset messages while running with never looking at the display.

Yes, back to the actual problem, please.

Without tracking I was able to force the battery burning in an area with no bt/satellite connection only to a max of 7%/hr, but I don’t really know if the 15% are related to the dive use or if it is a hw issue. Would be interesting, if the 15% was a one time thing or if he saw it some more times.

The actual battery drain for any given unit in any given scenario is imponderable. Yes, we know that the mail check is going to fail under water. It's going to retry. The iR modem is a power hog. So this is ONE source of battery drain. There ARE others. Is BT enabled? What about the backlight? Are we logging points and at what interval (which involves the GPS radio). Are we sending points via satellite? There is the ANT+ radio.

How accurate is the batter percentage on the unit?

I don't think we're going to find the answer. The device does not have any kind of intelligence with regard to being paired with a dive computer. That's not likely to change. So we are left with manual battery saving strategies.

The best way to limit the battery drain is to follow all the power-saving "tips". For example, these tips from the manual:

https://www8.garmin.com/manuals/webhelp/GUID-802DEF62-EBB2-463C-8C51-C58FB29F89E3/EN-US/GUID-47AF89E8-43F5-49C4-8017-2DEDEEEA73C7.html

Turning off inReach remote (ANT+) almost certainly disables the link with the dive watch. I'm not sure what you're using that FOR, so I don't know if this is advisable for you.

Even that does not go "as far as possible" in reducing power drain. See this forum thread for more details on power management on the M2.

https://forums.garmin.com/outdoor-recreation/inreach/f/inreach-mini-2/285837/maximizing-battery-life-on-the-mini-2/1377855#1377855

Why bother with the battery issue? There is only one thing certain there; battery capacity will go down under water without providing any benefit or usability. 

If the user can safely turn the device on and send an SOS at the surface, without the risk of loosing or damaging the unit, I consider that a solution to the need for communication. 

Why bother with the battery issue?

Because this is his problem and he asked about that. The thread started only with this question. We haven’t been able to reproduce 15% /hr, so the question is: is it related to diving use, a glitch or a hw issue? I you have other problems or questions, feel free to open a new thread.