Shearwater Teric vs Garmin Descent Mk1
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ATJ
Contributor
Built in rechargeable battery not user replaceable. Charges from a USB connected charging clip. I usually leave the clip in my car and charge on my way to dive sites (60-90 minute drive).
I charged it on Saturday morning on my way to a dive so it was at 99% on Saturday at around 7:30am. I did a 103 minute dive and have been wearing the watch since for daily use, step tracking and monitoring my heart rate and it is now sitting at 37% (Tuesday 6:30pm) so a little over 80 hours. It will get a charge on my way to my dive tomorrow.
I've done a few double dives and it had no problems at all. I guess I get 2-5 days out of it between charging depending on what I'm doing.
gcarter
Contributor
Adaptive works well, it is the setting I use on my Petrel 2.
From Garmin website
Rhyno
Registered
The mk1’s algorithm is in fact Buhlman (16c w configurable gradient factors) and does support Trimix.
After about a year of use it seems to have settled into about 2% battery per dive, and about 16 days of general (non-dive) wear. I was recently on a 10 day dive trip in the Bahamas. I charged it the day before I left, and once about half way in the trip.
After about a year of use it seems to have settled into about 2% battery per dive, and about 16 days of general (non-dive) wear. I was recently on a 10 day dive trip in the Bahamas. I charged it the day before I left, and once about half way in the trip.
ATJ
Contributor
My Mk1 was at 83% as I started my dive today. It was at 78% after the dive which was 114 minutes (115 minutes according to the Mk1 which adds a minute to the dive time 
)
)My Mk1 was at 83% as I started my dive today. It was at 78% after the dive which was 114 minutes (115 minutes according to the Mk1 which adds a minute to the dive time
That comes our to roughly 23 min dive per 1% battery drop. I'm not sure if this is the right way to measure battery efficiency on devices like these, not to mention that every device has different power draining features like compass and AI.
However, it will be interesting to compare the Teric in this manner in the absence of any other measurement. Will find out this weekend when I take the Teric for a spin. Will track batt % before dive and after the dive. Then compute # of min it takes for a 1% drop in batt life. Since the Teric has power hungry compass and AI, it's expected for the Teric to have a lower # of dive min per 1% batt life drop. But how low, we'll see.
If anyone has any suggestions on how to compare real world battery drain, please chime in. If nothing else, we can at least compare the same device.
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