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Eneloop PRO problems with GPSMAP 66s
Posted: Mon Sep 13, 2021 5:37 am
by MTB75
Just replaced 64s model with 66s. I installed eneloop pro batteries and device won't boot. Tried two different pairs. Voltage is 2.6V. FW 7.60.
Replaced with alkaline batteries, everything works fine. Switched accu settings to NiMh / NiMh precharged, no difference.
Batteries worked fine in 64s and they are charged so I guess they are not problematic.
Any idea?
Re: Eneloop PRO problems with GPSMAP 66s
Posted: Mon Sep 13, 2021 11:32 am
by GPSrChive
Did you install them with proper polarity?
Have not heard anything like this before and have never had issues with any NiMH batteries in any Garmin GPSr.
Re: Eneloop PRO problems with GPSMAP 66s
Posted: Mon Sep 13, 2021 11:34 am
by MTB75
Of course I did. Tried few times.
Very strange.
Re: Eneloop PRO problems with GPSMAP 66s
Posted: Mon Sep 13, 2021 1:26 pm
by GPSrChive
I might have guessed one of the batteries had an issue, but you stated you tried another set with identical results.
Can you try a different brand of NiMH for testing purposes? I have had great success with the Amazon house brand.
Re: Eneloop PRO problems with GPSMAP 66s
Posted: Mon Sep 20, 2021 6:58 am
by MTB75
Tried brand new Ikea Ladda yesterday and everything works fine.
Also tested all batteries in smart charger. Old eneloops pro still have good capacity (>2300 mAh) but higher internal resistance (140-180 milliohms) compared to new ladda (45-50 milliohms).
It is interesting that eneloops worked fine in GPSMAP 64s.
Re: Eneloop PRO problems with GPSMAP 66s
Posted: Mon Sep 20, 2021 3:25 pm
by GPSrChive
Very interesting test results!
Please let us know what happens when you test with new Eneloops, and what their internal resistance measures.