h a l f b a k e r yTrying to contain nuts.
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I can see the point about batteries but what has that got
to do with travelling to the moon 30 years ago? It's not
like they're related in any way. Perhaps you want Apollo
CSM fuel cells... |
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Still have to hook the fuel cells up correctly. Electricity has a directional aspect by nature. Isn't any way you can just chuck them in and have them work. |
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Something like an AA battery only with the +ive terminals at the ends and a -ive in the middle? |
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It's possible to do this already, although you have to make a modification to the device rather than to the battery - you just use a system of diodes, much like the ones in AC->DC converters. There's a reason why this isn't generally done, though - diodes always have a small leakage current which would make the batteries go flat faster than they would otherwise do. The manufacturers assume (correctly, imo) that people would rather their batteries lasted longer than could be put in either way around. |
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Actually, you could just redesign
the connectors. Make + in the
middle and - at the ends. Or
shape the battery such that it
can't go in the wrong way (square
at one end, round at the other, or
something). Isn't there a similar
idea kicking around here somewhere? |
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That wouldn't be too difficult, but it'd break every battery operated device in the world at once, and I'm sure the batteries would cost lots more. |
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I don't think this is what lubbit had in mind, though...More like what aj said. |
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StarChaser: The legacy factor is
huge, but the production cost
needn't be much higher. |
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waugsqueke: Oh come now. Next
you're going to tell me that
carefully inspecting batteries to
make sure they're put the right
way in builds character, or
something. Anything which makes
our gadgets simpler is a good
thing in my book. |
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rods: as has been said so many times before at the 'bakery, questions that start off with "why don't they..." often can be answered with the word "money". why would nokia or motorola want to give up a profitable part of their business to generic battery suppliers, when they can sell you the same thing at a higher price? it's true, you can buy generic batteries for your cell phone, but i have doubts about the reliability of those batteries, especially when the warranty is only good for a few months. |
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a second reason is aesthetics: while the cells inside the case are relatively the same between devices, the case itself has to have a certain "look" that is approved by marketing, human interface engineers, industrial designers, etc. |
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I was going to say the same thing as Mihali...Because batteries are bought from the original manufacturer, they make money from it. |
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I didn't say it would be more expensive to make them, I said the batteries would cost lots more. 'New convinence batteries! Never have to figure out which end of the battery to put in first!'. Not production, marketing. |
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I agree with waugsqueke, anyway...it's not like it's difficult to take five seconds to make sure the pointy bit is in the right direction. Only real utility I see for these are for changing batteries in the dark. |
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I think that this could be done mechanically. The battery receptor would have to be engineered so that it could *detect* the pointy end (the pointy end would force a mechanical change in the contacts--sliding them to a different point, perhaps--and changing the polarity). |
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klash - yeah, this is exactly what I had in mind. Batteries have a knob at one end that could push a contact or something and the wiring could be arranged to divert current the right way. It may be a bit fiddly, but then what isn't... |
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sirro - relax - it's meant to be funny. If it isn't then let it die quietly with some dignity. |
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Shouldn't be too hard mechanically... something like this
(let's use a single batery device for this example): three
flange-like conductive posts that go along the end of the
battery. The middle flange is offset away from the battery
by just less than the distance the positive terminal sticks
out from the battery. Same set up at the other end of
the compartment. The battery is slid between these two
sets of posts. The outer pair on either end contact the
flat ends of the battery, making a connection with the
negative side. The offset flange would only be able to
touch the positive terminal, no matter which way the
battery was inserted. |
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Does that make sense, or is it all a muddled mess? |
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I think I see it PotatoStew. In my diagram, the | is the positive post, and the i is the negative (think of it as a top-view). The distance between the + and - posts is the width of the positive nob on the battery. This only works if there is no conductivity on the outer ring of the + side of the battery, and there is conductivity on the entire base on the - side. |
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I think you've got it, gt. Including the necessary lack of
conductivity of the outer ring of the + side, which I'm not
sure is actually the case in real life, unfortunately. |
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Here's what a side view of one of the ends of the setup
would be like: |
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..| <-- (-) conductor, touches flat part of battery
| <-- (+) conductor, touches +knob on battery
..| <-- (-) conductor, touches flat part of battery |
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The positive terminal on the battery fits right in between
the negative conductors, touching the positive
conductor. On the other end of the battery, the flat
negative surface touches the outer conductors, but not
the offset positive conductor. |
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Depends on the brand of battery. Some have a cap that covers the whole end of the battery, some have a ring of the outer material, but I think this would do it. And without requiring more expensive batteries, and without making every battery powered thing in the world useless. |
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Would just have to make one side or the other spring-loaded, so it'd push the battery into the contacts. |
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// relax - it's meant to be funny. If it isn't then let it die quietly with some dignity // |
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AND THAT sums up much of what the halfbakery is about. Such a challenge to follow that guideline. |
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Most of the annos here are about a device that doen't care which way round you insert a standard battery. A few suggest a non-standard battery you can insert into a non-standard holder either way round. But none have grappled with the original problem, to design a new battery that can be inserted either way round into a pre-existing device. |
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Were the 'bakers of 13 years ago really that slack? |
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Never let a sleeping dog lie. |
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The consumer electronics industry with their abundance of connectors, plugs and cables has shown how it is done: use adapters. If the new battery design with the + conductor in the middle needs a new battery case design, then build the new batteries with a slightly smaller diameter and, for legacy devices, put them in a adapter casing which connects the new design to the legacy device. |
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