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Planet Bike computer problem

Old 11-20-23, 04:55 PM
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Planet Bike computer problem

I have a Planet Bike wireless computer that stopped working. It worked fine 3 days ago then it wonít show speed etc. The display does comes on.
I changed the battery in the pickup unit but still nothing.
The only thing that has been done to the bike is I had the rear derailleur replaced, but that isnít near the unit.
What am I possibly overlooking? I had an issue a couple of years ago with the pickup unit being too low for the display unit to get a signal.
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Old 11-20-23, 05:48 PM
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I just had a thought. Do coin batteries come with a plastic shield that needs to be removed before installing?
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Old 11-21-23, 08:44 AM
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I had a pack of Eveready CR2032's recently that were in individual plastic shells inside a bigger plastic bubble pack. They were a real big pain to get out of the package. But I have to believe that if you'd left plastic of any sort on it, then you'd never get it in the holder.

Some have claimed that the coatings some coin batteries come with to make them nasty tasting to those that want to put them in their mouth's can keep them from making good contact in the holder. I don't know myself if that is a real thing or not. But I have had a lot of bad coin batteries right out of the package. And that's happened too often over the last decade or more. Some say counterfeit coin batteries that are just repackaged dead batteries are a issue. But you'd think by now the coin battery industry would be telling us what to look for if that were a real big issue.

IMO, manufacturer's and electronic designer's ought not use them when their products have room for AAA's, AA's or larger batteries. I even willingly paid more for a instant read pen thermometer that uses a AAA battery instead of their previous model with coin batteries.

hmmm.... you got me ranting. But still, I can't stand coin batteries. Especially when used in things that have room for normal batteries.


Oh... and you might consider the price you paid. Lower cost stuff comes with fewer quality controls at the factory. So some of their units might last and more of them might go bad sooner.

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Old 11-21-23, 09:26 AM
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Battery in sending unit

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Old 11-21-23, 09:27 AM
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Originally Posted by pepperbelly
I just had a thought. Do coin batteries come with a plastic shield that needs to be removed before installing?
No. The package they come in isolates the batteries.
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Old 11-21-23, 09:49 AM
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Originally Posted by Iride01
Some have claimed that the coatings some coin batteries come with to make them nasty tasting to those that want to put them in their mouth's can keep them from making good contact in the holder. I don't know myself if that is a real thing or not.
OT but related. A pediatrician I was talking to earlier this year had a horror story about catching a coin battery on a child's X-ray. Fortunately she caught it soon enough to send the kid to emergency surgery just in time -- the battery was starting to leak, and she said a few more hours and the kid would have had severe chemical burns on his esophagus. (a) Don't try this at home! (b) Keep those batteries away from kids!!
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Old 11-21-23, 09:50 AM
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I will test the battery when i get home.
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Old 11-21-23, 10:26 AM
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Originally Posted by pdlamb
OT but related. A pediatrician I was talking to earlier this year had a horror story about catching a coin battery on a child's X-ray. Fortunately she caught it soon enough to send the kid to emergency surgery just in time -- the battery was starting to leak, and she said a few more hours and the kid would have had severe chemical burns on his esophagus. (a) Don't try this at home! (b) Keep those batteries away from kids!!
I hear about this often enough that I wonder why electronic maker's keep using coin batteries when other batteries will fit inside their devices.

Or do AAA's get swallowed just as often and we just don't hear about that?

I guess I'm continuing my rant against coin batteries. Particularly the CR2032, CR2016 and CR2025's.
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Old 11-21-23, 10:47 AM
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Originally Posted by Iride01
I hear about this often enough that I wonder why electronic maker's keep using coin batteries when other batteries will fit inside their devices.

Or do AAA's get swallowed just as often and we just don't hear about that?

I guess I'm continuing my rant against coin batteries. Particularly the CR2032, CR2016 and CR2025's.
??? The CR* are "watch" batteries. Not really a place for AAA. Sure, there might be some devices (which you don't specify) that could use AAA batteries instead but not all devices that use CR*.

https://electronics.stackexchange.com/a/5668

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Old 11-21-23, 10:52 AM
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Originally Posted by Iride01
I hear about this often enough that I wonder why electronic maker's keep using coin batteries when other batteries will fit inside their devices.

Or do AAA's get swallowed just as often and we just don't hear about that?

I guess I'm continuing my rant against coin batteries. Particularly the CR2032, CR2016 and CR2025's.
I don't think any of my bike devices that use a CR2032 have space for a AAA in their current configurations (HR sensor and power meter sensors).
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Old 11-21-23, 12:06 PM
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The battery tests as having 3.25v.
I made sure the magnet on the spoke is in the correct position and tight and the lower unit is correctly positioned. All are.
I push the computer on, lift the front of the bike and spin the front wheel- nothing.
I will just buy a bew computer.
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