some battery timings for 66st

Discussion related to the Garmin GPSMAP 66 series GPSr
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987
Posts: 31
Joined: Tue Apr 28, 2020 5:40 pm

some battery timings for 66st

Post by 987 »

GPSMAP 66st software 4.10, gps 2.70
Battery timings for anyone interested.

Battery Varta NiMH 2100 mAh and 2600 mAh.

Normal operation.
Display at 30 second timeout 40 % backlight, battery save mode off. GPS+GALILEO+WAAS/EGNOS.
About 3 hours of active usage. Logging every 2 seconds.
Battery time: 14:30 (hours:minutes) with 2100 mAh, 17:00 with 2600 mAh.

Battery save option.
Display at 30 second timeout 40 % backlight, battery save mode turned on. GPS+GALILEO+WAAS/EGNOS.
About 3 hours of active usage. Logging every 15 seconds.
Battery time: 15:00 (hours:minutes) with 2100 mAh, 17:45 with 2600 mAh.


Expedition mode.
Display at 30 second timeout 40 % backlight, battery save mode turned on. GPS+WAAS/EGNOS.
About 1,5 hours of active usage per 24 hours. Logging every 15 seconds while active.
When in expedition mode, the logging occurred every 3 minutes.
Battery time: 85 hours (2100 mAh). As i turned it on after approx 83 hours, the battery indicator was down to one bar.
At this stage the unit would not re-enter expedition mode because batteries were too low, so it remained on till the end of batteries.


What strikes me the most is how little saving it is to use battery save mode for the display.

gpsrchive
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Re: some battery timings for 66st

Post by gpsrchive »

Thank you for sharing your test results.

This reminds us we still need to do some battery run time testing also.

During these tests, did you have Bluetooth or Wi-Fi enabled? ANy ANT+ sensors connected? Was ANT+ enabled?

987
Posts: 31
Joined: Tue Apr 28, 2020 5:40 pm

Re: some battery timings for 66st

Post by 987 »

Ant off. Bluetooh off. Wifi on about 5 minutes in total per test. All in all one can say all sensors were off. I use the GPS standalone.

g66
Posts: 97
Joined: Wed Jul 03, 2019 1:48 pm

Re: some battery timings for 66st

Post by g66 »

Did you test inside or outdoor
I thing, if signal is fine, it takes less bat

987
Posts: 31
Joined: Tue Apr 28, 2020 5:40 pm

Re: some battery timings for 66st

Post by 987 »

60 % indoor. 40 % outdoor.
When indoors i made sure to place the unit in a position where signal was found, this was made to avoid excessive logging (1 point per second, as described in a different topic).

But, perhaps it is a stupid question from my end, why would poor GPS signal drain more battery or when GALILEO and GLONASS are enabled?
Isn't the unit receiving the signals it can find and calculates the location from those?

The "battery save" mode and the lower frequency of tracking does not seem to extend the battery life very much.
My experience for this and other garmin GPS units is that battery life is about the same, no matter how good or bad the satellite signal is.

g66
Posts: 97
Joined: Wed Jul 03, 2019 1:48 pm

Re: some battery timings for 66st

Post by g66 »

I read about some tests years ago...indoor testing had more battery drain then testing under the sky with same settings

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