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Garmin cadence sensor battery drain?

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Garmin cadence sensor battery drain?

Old 10-18-11, 12:25 PM
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charliekeri
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Garmin cadence sensor battery drain?

Does anyone notice a short battery life (CR2032) on their Garmin 305/705/800 cadence sensor? They actually seems to die quicker on the bikes I don't use as much - if that makes any sense. Anyone?

I was just wondering if I just got a bad batch of ebay batteries. probably......
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Old 10-18-11, 12:27 PM
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14months and mine is still going strong. Internet CR2032's are notoriously hit and miss, I bet that's all it is.
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Old 10-18-11, 12:53 PM
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charliekeri
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thanks
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Old 10-18-11, 01:03 PM
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I've also had poor luck with mine but I use the $.25 Sony batteries from China =O
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Old 10-18-11, 01:13 PM
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Four sets on different bikes using batteries from the local grocery store. >12 months no replacements needed yet.
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Old 10-18-11, 01:28 PM
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14 months with mine without an issue. Still on the stock battery whatever that is.
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Old 10-18-11, 04:05 PM
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I have an edge500 assuming it uses the same gsc10 sensor and I haven't had any issues using it this season. How long are they suppose to last. Wouldn't it depend on how much use the sensor gets used as to how long batteries will last?

Last edited by triumph.1; 10-18-11 at 04:44 PM.
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Old 10-18-11, 04:10 PM
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25 months on the original battery for me.
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Old 10-18-11, 04:46 PM
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When the GSC 10's first came out they had several problems including failure of certain contacts within the unit. Some cases of poor battery life were thought to associate with leaving the crank positioned so as to align the magnet with the GSC 10's sensor. In my case I believe the battery supplied with the unit was just bad. I think I've had the battery in our Tandem's sensor for almost two years.
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Old 10-18-11, 06:30 PM
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I like to replace once a year so they last at least that long
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Old 10-18-11, 06:35 PM
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It's been 13 months on the original battery. I noticed this week that I lose the cadence reading if I move the sensor just slightly farther away from the crank, so it's probably ready to be changed soon. My rides are loaded in My Tourbook, and it reports 256 hours of ride time, which includes coasting time, of course.

When I had a front blinky that used CR2032 coin batteries, I bought them in bulk from batterybob.com. They sell real Maxell batteries in blister packs, 5 for $1.50 each, or 17 for $1.25 each, etc. Fast free shipping, too.

Last edited by rm -rf; 10-18-11 at 06:40 PM.
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Old 10-18-11, 06:48 PM
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10 months for me
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Old 10-18-11, 07:00 PM
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Make sure you don't leave either of the magnets lined up with the sensor, that will drain the battery quickly. For mine, it usually lasted 2500-3000 miles on a battery. Now that I'm using on the speed sensor with no magnet, the battery lasts about 4000 miles
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Old 10-18-11, 09:11 PM
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Water leaks into the sensor and shorts out. It seems that I replace sensors faster than batteries. Garmin is pretty good with replacing them under warranty.
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Old 10-18-11, 09:28 PM
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Originally Posted by brian416 View Post
Make sure you don't leave either of the magnets lined up with the sensor, that will drain the battery quickly. For mine, it usually lasted 2500-3000 miles on a battery. Now that I'm using on the speed sensor with no magnet, the battery lasts about 4000 miles
+1
The sensor contains a reed switch.
The switch is normally open, but closes briefly as the magnet passes by.
If you leave the bike parked with a magnet next to the sensor, it can hold the switch closed and drain the battery overnight.
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Old 10-18-11, 09:33 PM
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Actually, my speed/cadence sensor died before the battery did. Luckily Garmin has amazing warranty and staff, and in 3 days I had a new one all ready to go.
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Old 10-18-11, 09:52 PM
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Herbie53
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Originally Posted by charliekeri View Post
Does anyone notice a short battery life (CR2032) on their Garmin 305/705/800 cadence sensor? They actually seems to die quicker on the bikes I don't use as much - if that makes any sense. Anyone?

I was just wondering if I just got a bad batch of ebay batteries. probably......
I just revived both my cadence/speed sensor and HRM by taking the battery out and cleaning / bending the contact out a bit. There was some stuff about it on the Garmin forum.
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Old 10-18-11, 10:07 PM
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Originally Posted by Herbie53 View Post
I just revived both my cadence/speed sensor and HRM by taking the battery out and cleaning / bending the contact out a bit. There was some stuff about it on the Garmin forum.
Was your symptom on both just total death? On my old cad/spd sensor, it would show odd speeds. I would be doing 20MPH and then all of a sudden it would say I was doing 60MPH, then 0MPH and auto stop.
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Old 10-18-11, 10:10 PM
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Herbie53
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Originally Posted by nixternal View Post
Was your symptom on both just total death? On my old cad/spd sensor, it would show odd speeds. I would be doing 20MPH and then all of a sudden it would say I was doing 60MPH, then 0MPH and auto stop.
the cadence sensor was jumping around (false really high numbers). Same with the HR monitor.
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