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Edge 840 maximum charging rate

Martin198
5 months ago

Hi folks - checked two searches for maximum charging and maximum charging rate, but nothing came up, so ...

Does anyone know the maximum charging rate that the Garmin 840 (or 540 or 1040) can actually accept?
This is important for endurance events, as speed of charging becomes helpful (so while it's 'nice' to devices to not charge faster than the recommendation (cars, phones, anything) - and Garmin suggest on their help page for the 840 to charge at 1A, can the devices charge faster if I used a 2.1A charger for example ?)

I can't find anything on the Garmin site or on this 840 page so apologies if this has been answered before

  • 0 5 months ago

    With USB charging you get the whatever is least, the max rate of the charger or the max rate of the device.  The max for the 840 is 1A at 5V, so that's the fastest you can get.  I've tried mine hooked up to a variety of chargers (e.g. one that can output 3A at 5V  to 1.5 A at 12V) via a USB charge monitoring device and that's the fastest I got.  My 840 runs plenty long enough for my riding, but in the past with an 820, I connected it to an small inexpensive stick battery with 6700mAh capacity, ~10x the capacity of the 820 battery.

  • 0 5 months ago

    Awesome. That was what I needed to know. 1A maximum it is. All helps with purchasing decisions. 
    (I need c.26 hours of use)

  • 0 5 months ago in reply to Martin198

    Battery at 60% here and I can see on my charger that it's charging at 0.4A.

    Use a good usb C cable. I had one before that was just USB A -> USB C and it was charging at 0.1A ...

  • 0 5 months ago in reply to Martin198

    I did a Chase the Sun (212 miles in 14 hours) ride last weekend and still had 54% battery at the end. That was with auto-brightness, auto-GPS mode, HRM, RTL515, SRAM derailleur and power meter, navigation on and frequent interaction. On that basis, I should be able to do 26 hours with everything on. With battery saver, however, you should easily be able to get 30+ or even 50+ hours and still keep the map on. So why the need for additional charging at all in your scenario?

    Also, if you really do need more juice, why stop to charge it and simply charge it from a battery pack as you go?

  • 0 5 months ago in reply to George

    14hrs for half battery sounds good (was that a 1040 with or without solar just out of interest - it’s useful data?)

    Ps. Not stopping to charge - the charge rate info for for choosing which battery pack as they have different outputs. 

    battery saver - I think from reading that battery saver is about switching the map off, so not sure what battery saver really gets me (would be fine if I didn’t need routing - some events I don’t and then with my wahoo I just switch off everything bad basic data recording and it helped then). So all manufacturers allow us to stitch off the backlight and routing … in my case I’m basing the battery life on routing the whole way. 
    so your data is helpful.