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Extended battery life is very neccesary for using the device on long brevets and multi-day endurance racing. Can Garmin Edge cycling GPS units 500/510 and 800/810 be charged while riding via external battery pack like or USB dynamo charger?

Can you plug in while riding? Are only certain devices able to charge the unit while it's recording / navigating?

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My 500 goes into a special charging mode when it's plugged in where it can't do anything else. Can't say for the others. –  alex Apr 22 '13 at 14:12
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Apparently it's possible. Garmin also sells a battery pack, the description of which appears to indicate suitability for 24-hour races. –  Stephen Touset Apr 22 '13 at 16:24
    
I have used a Garmin eTrex Vista HC without batteries, plugged via USB. I didn't remember if it switches between different modes upon plug and unplug, but I believe you could put rechargeables inside and also plug it to a generator-hub usb adapter. Actually I plan to do this with my new smartphone. –  heltonbiker Apr 22 '13 at 20:50
    
A different approach would be to plan ahead and ALWAYS let the device recharging at the checkpoints. Easier to say than do... (but you'll have to rest anyway, won't you?) –  heltonbiker Apr 22 '13 at 20:52
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@ChrisH Boot time is about a minute depending on signal and how many maps you have. You'll lose more time than that changing batteries, as the mount and battery compartment pretty much require you dismount to change batteries. You'll get more life out of alkalines. You might want to experiment with different types of batteries. One guy in this thread states he gets 32 hours from disposable lithium AAs. Lithium are also lighter than alkaline, which is always a plus for cycling. I always us NiMH as my rides aren't that long. –  Kibbee Apr 7 at 12:54

5 Answers 5

up vote 5 down vote accepted

Just verified that the 510 can be attached to power while on/in use. It continues to operate. When the external power source is removed, it will give a message to that effect, but does not power down (like the nuvi/car versions do).

Note that you (obviously) have to open the weather seal to plug in power.

Also worth noting, the 510 will go into a different mode when you plug it into a computer. Unsure if it will continue to record, but the screen shows the computer attached so suspect not.

For long trips like you describe, a device like these http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=phone+battery+backup should do the trick.

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If plugged into a PC, it switches to disk mode, and will not function as a bike computer or GPS. If plugged in to a wall outlet, it will function just fine. –  zenbike Feb 27 at 18:25
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Good news, but test before you rely on it. There are (at least) 2 ways a device can detect whether the "USB" port it's connected to is a PC or a charger. It will obviously fail to enumerate plugged in to a dumb charger (i.e. fail to talk to it), but if it relies on a charger presenting as a dedicated charging port and yours doesn't, it won't charge - in fact I once had a phone that claimed to be charging and kept the screen on in this case -- effectively discharging. Some top-up battery packs don't fit a DCP-resistor. –  Chris H Apr 7 at 11:02

Edge 800 can be charged from a hub dynamo I use a B&M Luxos IQ2 U to provide the power and the standard Garmin cable

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I can confirm you can charge a Edge 800 while in use. In my case a Schmidt hub dyno + biologic ReeCharge on some long tours. –  Rider_X Jul 24 '13 at 6:15

I just completed a 300K brevet last weekend and my Garmin 500 ran out of juice about 2 miles from the end of the 190 miles. 18 hours. I just tried to plug it into an external battery that will charge phones and the Garmin 500, but the Garmin will not operate while plugged in and charging. Note this is the Garmin 500, not the 510.

A friend used an 810 on the ride charging through an external battery on the same ride.

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I use the Garmin 800 and an external battery with USB output.

The Garmin will keep running for days like that, with no backlight BUT the data recording cannot cope with a 24 hour bike ride.

On my last two 24 hour cycle events, the Garmin corrupted the activity file at around 23 hours which was somewhat 'annoying'.

I have tested it on distance, with car journeys, and it can cope with 650km in 12 hours.

But cycling 560km in 24 hours is not feasible, it seems. Probably too many data points.

You should stop the timing at 12 hours, reset, and start a new 12 hour session.

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I can confirm that the garmin 910XT watch is also able to be recharged while recording an activity, the display changes to charging & its % so no information, the Garmin 500 cant be recharge as it will reset any activity unless there is a setting that I haven't seen.

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I don't get the point about the 910XT, as this unit has not been in question as far as I can see. Do I get something wrong? –  Benedikt Bauer Feb 26 at 11:42

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