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I don't think swapping batteries is a good analog for fast recharge. For one, the cost of a kilowatt hour in AA batteries well exceeds $100, even buying in 20-c

I don't think swapping batteries is a good analog for fast recharge. For one, the cost of a kilowatt hour in AA batteries well exceeds $100, even buying in 20-count lots. From the wall, it costs less than a dollar. Swapping batteries is also significantly more effort than plugging in a microUSB or whatever.

tjoff 15y ago
Still way to cumbersome. I would love to be able to get a quick fix but I won't trade any battery life for it. If I'm ever around to recharge quickly I can just as well let it sit there for a while, at least the vast majority of times. Please note how convenient it is to charge from a USB-port, a micro usb cable is all that is needed to be able to charge pretty much anywhere (and they are cheap enough leave one at home/work/laptop/pocket. With a fast charger I'd have to bring it along and plug it in everywhere - not worth it. And I most definitely would like at least the same poor battery life that we have today, otherwise you wouldn't be able to last a day without a charge and that it just unacceptable regardless of how easy or fast it is to recharge.
sliverstorm 15y ago
It sure won't be a microUSB port. To charge a middle-of-the-road 2500mAh capacity battery in, say, 10 seconds, you must flow something like 70A @ 5V, and that's ignoring the fact that capacitor charge curves are of the exponential decay variety (i.e. drastically higher initial power draw). (A real-world application would probably kick up the voltage and lower the current, but USB is always 5V)
anamax 15y ago
> I don't think swapping batteries is a good analog for fast recharge. For one, the cost of a kilowatt hour in AA batteries well exceeds $100 Who said that you can only swap new/non-rechargable batteries? > Swapping batteries is also significantly more effort than plugging in a microUSB or whatever. Yes, but you can swap batteries where there's no power. You're not willing to carry a spare set of batteries yet you insist that you're willing to carry a charger....

tjoff 15y ago

Still way to cumbersome. I would love to be able to get a quick fix but I won't trade any battery life for it. If I'm ever around to recharge quickly I can just as well let it sit there for a while, at least the vast majority of times. Please note how convenient it is to charge from a USB-port, a micro usb cable is all that is needed to be able to charge pretty much anywhere (and they are cheap enough leave one at home/work/laptop/pocket. With a fast charger I'd have to bring it along and plug it in everywhere - not worth it. And I most definitely would like at least the same poor battery life that we have today, otherwise you wouldn't be able to last a day without a charge and that it just unacceptable regardless of how easy or fast it is to recharge.

sliverstorm 15y ago

It sure won't be a microUSB port. To charge a middle-of-the-road 2500mAh capacity battery in, say, 10 seconds, you must flow something like 70A @ 5V, and that's ignoring the fact that capacitor charge curves are of the exponential decay variety (i.e. drastically higher initial power draw). (A real-world application would probably kick up the voltage and lower the current, but USB is always 5V)

anamax 15y ago

> I don't think swapping batteries is a good analog for fast recharge. For one, the cost of a kilowatt hour in AA batteries well exceeds $100 Who said that you can only swap new/non-rechargable batteries? > Swapping batteries is also significantly more effort than plugging in a microUSB or whatever. Yes, but you can swap batteries where there's no power. You're not willing to carry a spare set of batteries yet you insist that you're willing to carry a charger....