GPSrChive Discussion Forum

Hi
If you have a Garmin NiMH Akkupack (GPSMAP 66s) is it possible to se somewere the level (in %) of this Akkupack or when the battery is full
Please for help. It will be very usefull.
BR Tomy

You can see the actual battery voltage in the Diagnostic Screen, but not charge percentage.

It is my understanding that calculating the actual charge percentage of NiMH batteries is not an exact science, unlike the Li-ion battery in your phone, which is.

But with a montana, it is possible to see the % battery
(Doubleclick of powerbutton on Montana)

Probably only when the Li-Ion battery is installed in the Montana.

gpsrchive wrote: Fri Sep 20, 2019 1:34 pm You can see the actual battery voltage in the Diagnostic Screen, but not charge percentage.

It is my understanding that calculating the actual charge percentage of NiMH batteries is not an exact science, unlike the Li-ion battery in your phone, which is.

Hi, thanks for info,, how do i get diagnostic screen (maybe enter+power butt.. ) i try but nothing happen in may GPSMAP 66s

You have to hold those two buttons with the POWER OFF.

I do not need to hold 2 buttons


Unit is off
Press ENTER and hold the button
Press POWER for a short time

Remain holding ENTER

Select OLD TEST MODE

I have 2,63 Vbat with fresh black eneloop

https://www.amazon.de/Panasonic-extrast ... 168&sr=1-3


But you can also take LADDA from IKEA
Seems to be the same but cheaper version
https://www.slrlounge.com/panasonic-ene ... -the-same/

That’s only possible for a device with an internal, or smart battery pack.

If the batteries in a Garmin are sitting right at the nominal 3 Volts between them,
how is it supposed to know if it has dirty old carbon batteries from the 80’s with ten minutes left in them?

You tell the Garmin the type of battery you put in it, it reads the voltage, and plots that on a typical discharge curve
for the type of battery, to find a relative position to display on a meter.

For Garmin’s own battery pack, which doesn’t have any smarts, the Garmin couldn’t even tell the difference between two battery packs,
only that they are of a type that begins at a lower voltage, and has a different discharge curve than alkalines.

For laptop battery pass, or even batteries in a phone, the device can look at previous discharge cycles, and it’s a new ball game.

g66 wrote: Tue Sep 24, 2019 6:42 am I do not need to hold 2 buttons


Unit is off
Press ENTER and hold the button
Press POWER for a short time

Remain holding ENTER

Select OLD TEST MODE

I have 2,63 Vbat with fresh black eneloop

https://www.amazon.de/Panasonic-extrast ... 168&sr=1-3


But you can also take LADDA from IKEA
Seems to be the same but cheaper version
https://www.slrlounge.com/panasonic-ene ... -the-same/

Thanks it works now

Hi again

Is there any way to explain what each function means in Diagnostic Screen?
Like: - Wi-Fi TX (options in) etc.
If any have some info about it please for help, i would like to understand this options in Diagnostic Screen, maybe some function i can turned on/off to improve my GPSMAP 66S
Thanks Br Tomy