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Do you store 9V batteries in your bike bag?

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Do you store 9V batteries in your bike bag?

Old 01-13-15, 07:22 PM
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Papa Tom
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Do you store 9V batteries in your bike bag?

A firefighter friend of mine, upon noticing that I commonly store one or two 9V batteries in my panniers with tools and other metal objects, recently turned me on to this video, which demonstrates how a 9 volt, upon contacting a metal object in a certain way, can start a serious fire.

If you keep 9V batteries for any of your bike electronics in your panniers or rack bags, you ought to take a look at the quick video below.

https://www.youtube.com/watch?v=CnVDayI-gwI
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Old 01-13-15, 07:44 PM
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is that the guy that burned down his house when he replaced all the batteries in his smoke alarms? I got smoke alarms that had built-in rechargeable batteries after that
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Old 01-14-15, 08:07 AM
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I don't think I own a single thing that uses 9v batteries. However, there are caps that you can put over the top of them to protect against this. The better ones used to come with them but I haven't seen them in a while.

Go to Amazon and search for 9v battery cap.

Personally I'd just 3D print them for about 2 cents each but most people don't have a 3d printer yet. If you do, just go here for a deluxe model cap.

9V Battery Survival Safety Cap by robrook - Thingiverse

Or just put a bit of tape (I'd use duct tape) over it.
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Old 01-14-15, 08:33 AM
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I'd think just common sense would dictate covering the contacts. Even if there was no fire risk, shorting out the contacts would drain the battery and defeat the purpose of carrying a spare anyway.

So so just curious - what do you use those in?
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Old 01-14-15, 08:43 AM
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Small zip-top bag. I use 9V for my brake lights (LED clearance lights).
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Old 01-14-15, 08:50 AM
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I don't have anything that uses 9v batteries. However any batteries that get shorted by something conductive can be a serious problem. Just put each battery in a cheap sandwich bag. I Always have a back up head light with me with extra AA Eneloops. I don't store anything with batteries in them.
Just bag everything separately and them put those little bags in one common bag to keep them together. Keeps them dry too.
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Old 01-14-15, 12:12 PM
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AA batteries have the +and - terminals on opposite ends .. 9v snaps are on the same side ..

9v is in my Guitar stomp EFX pedals . & pre amp in the Acoustics .
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Old 01-14-15, 02:02 PM
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I don't typically carry 9V batteries with me, and I agreed with those who say they don't have anything that takes a 9V battery . . . except:
- smoke alarms
- keypad garage door opener
- remote garage door opener (I sometimes have this in my trunk bag, but never carry any spare batteries)
- assorted remote controls for studio lighting
- electronic lock on safe (actually changed to a mechanical lock, then replaced the safe with a larger one)
- electrical test instruments, e.g., digital multimeter, fox-and-hound
- laser distance measurer

Last edited by KenshiBiker; 01-14-15 at 02:40 PM. Reason: Remembered Some More . . .
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Old 01-14-15, 02:41 PM
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With any batteries, common sense would suggest keeping them from shorting out, just to not needlessly deplete them if nothing else. A piece of electrical tape over the end or contacts can work well for this.
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Old 01-14-15, 03:14 PM
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Originally Posted by fietsbob View Post
AA batteries have the +and - terminals on opposite ends .. 9v snaps are on the same side ..

9v is in my Guitar stomp EFX pedals . & pre amp in the Acoustics .
Yes they do. That doesn't change anything I just said.

You still should put them in individual bags. It will work no matter where the terminals are. Then all the individual bags with a battery in them in a bag just to keep them together.
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Old 01-14-15, 03:20 PM
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Originally Posted by KenshiBiker View Post
I don't typically carry 9V batteries with me, and I agreed with those who say they don't have anything that takes a 9V battery . . . except:
- smoke alarms
- keypad garage door opener
- remote garage door opener (I sometimes have this in my trunk bag, but never carry any spare batteries)
- assorted remote controls for studio lighting
- electronic lock on safe (actually changed to a mechanical lock, then replaced the safe with a larger one)
- electrical test instruments, e.g., digital multimeter, fox-and-hound
- laser distance measurer
We're talking about keeping the batteries in a pannier for bike electronics. Not the whole house. What do you have that uses 9v on a bike?
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Old 01-14-15, 04:24 PM
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Originally Posted by 2manybikes View Post
We're talking about keeping the batteries in a pannier for bike electronics. Not the whole house. What do you have that uses 9v on a bike?
Well, initially, I asked if anybody kept them in their bags for bike electronics, but only because I thought I was the only one who might be carrying them for meters and tools that I use at work. My post was just an attempt at getting the word out there, and I'm glad it had value for a few of you. For the rest of you who pounced all over it on this and other forums (sorry Administrators...I did not know the rule about cross-posting!), come clean now -- how many of you went and checked on all the 9 volt batteries in your kitchen junk drawer?
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Old 01-14-15, 05:01 PM
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Originally Posted by Papa Tom View Post
come clean now -- how many of you went and checked on all the 9 volt batteries in your kitchen junk drawer?
Nope.

I know we've got batteries, kept neatly in a plastic container, but I couldn't tell you if we've got 9V. I just use triple-As for my wireless mouse and red taillights.
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Old 01-14-15, 05:40 PM
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Originally Posted by Papa Tom View Post
how many of you went and checked on all the 9 volt batteries in your kitchen junk drawer?
I have a couple of spares in the house for the smoke and radon detectors, and keep those batteries in the manufacturer's packaging until they're needed. When the used ones are depleted they go to the battery recycler.
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Old 01-15-15, 06:13 AM
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I have a tiny plastic cap with an LED that snaps onto the top of my 9-volt. Small and light flashlight.
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Old 01-15-15, 06:44 AM
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Originally Posted by Athens80 View Post
I have a couple of spares in the house for the smoke and radon detectors, and keep those batteries in the manufacturer's packaging until they're needed. When the used ones are depleted they go to the battery recycler.
I am with you here, other than smoke detectors I only own two other devices that use 9V batteries. A sound pressure meter and an infrared thermometer. Anything that still uses a 9v alkaline cell has to be old tech and past the end of its useful life.
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Old 01-15-15, 12:13 PM
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I bet some of us use them in their garage door openers.
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Old 01-15-15, 03:16 PM
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I agree that carrying 9v batteries is not done often by cyclists, as I can't think of a reason to do so. The warning is useful, though. I think electrical tape, which is made for electrical insulation, is a suitable and cheap solution for tossing 9v batteries into places with lots of metal.
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Old 01-15-15, 04:47 PM
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I'm surprised nobody pointed this out yet:

One sure-fire, always works, no-matter-how-wet fire starter used in Boy Scouts is a 9V battery and steel wool:
How to Start a Fire With 9V Battey and Steel Wool: 3 Steps

#t=93
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Old 01-15-15, 04:57 PM
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Originally Posted by WheresWaldo View Post
... Anything that still uses a 9v alkaline cell has to be old tech and past the end of its useful life.
The finest digital multimeter ever made, the Fluke 77, still uses a 9V battery as does my new infrared non-contact therometer I bought for cheap on Amazon. Not that I carry them on my bike but this is the internet, every declarative statement must be refuted with obscure examples!
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Old 01-15-15, 07:07 PM
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Originally Posted by Mr IGH View Post
The finest digital multimeter ever made, the Fluke 77, still uses a 9V battery as does my new infrared non-contact therometer I bought for cheap on Amazon. Not that I carry them on my bike but this is the internet, every declarative statement must be refuted with obscure examples!
More obscure facts, the Fluke 77 was introduced in the late 80's early 90's , I stand by my old tech statement.
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Old 01-17-15, 03:48 AM
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Originally Posted by Papa Tom View Post
come clean now -- how many of you went and checked on all the 9 volt batteries in your kitchen junk drawer?
Originally Posted by Machka View Post
Nope.

I know we've got batteries, kept neatly in a plastic container, but I couldn't tell you if we've got 9V. I just use triple-As for my wireless mouse and red taillights.
I was in our battery box today, putting away some freshly charged Triple-As ... and there are no 9 volt batteries in there. Not a one.
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Old 01-17-15, 09:58 AM
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Originally Posted by Papa Tom View Post
Well, initially, I asked if anybody kept them in their bags for bike electronics, but only because I thought I was the only one who might be carrying them for meters and tools that I use at work. My post was just an attempt at getting the word out there, and I'm glad it had value for a few of you. For the rest of you who pounced all over it on this and other forums (sorry Administrators...I did not know the rule about cross-posting!), come clean now -- how many of you went and checked on all the 9 volt batteries in your kitchen junk drawer?
I just keep them in the retail packaging until using them.

No one should scoff at you getting the word out, since it's the sort of thing a person wouldn't necessarily think about. Even with the connector on I tape around it (on my bike) to prevent water or anything else from shorting the terminals.
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Old 01-24-15, 06:27 PM
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I've carried a 9 volt battery on hiking/camping trips before, as an emergency fire starter with a bit of "fine" steel wool. And since duct tape is always handy in an emergency also, a short length of duct tape was halved and wrapped around the 9 volt battery in two directions, two or three wraps around the wide sides of the battery and up, over the top of the terminals to keep anything metal from touching them, and the rest of the length of duct tape was wrapped around the battery for storage. The steel wool was packaged and kept in a separate compartment. Never had problems with the battery shorting out on anything and never needed to use it in place of a Bic lighter or matches. The duct tape did come in handy a few times. I carry spare AA batteries for my headlight and a AAA battery for the tail light, but they're not a problem for shorting out in the repair bag.
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