Thursday, September 21, 2006

I too am excited...

About batteries.  Just like this guy isSomeone pointed out this nifty USB chargeable battery earlier and I just saw it again.

That is a neat idea - unfortunately nothing I use uses AA battery.  I still think any device that has

  1. a rechargeable battery
  2. a USB connection

should just be able to DO THIS - charge off of the USB port.  My phone can.  My camera and XM radio - both have USB connections and rechargeable batteries - cannot.  Time to get with the program I think.  Less plugs when we travel.



Anonymous Tom Fox said....

As for the Inno charging via USB, I found a couple of notes (nothing official but may be useful) saying that if you use the USB cable supplied:

"If you connect your Inno to the USB on your PC and the Inno is displayed as a drive letter on your PC (the screen will say something like, "Disconnect only after safe disconnect from the PC". Then yes, it will charge the Inno. If the display is blank or says, "Ok to disconnect", it will NOT charge the Inno "




Fri Sep 22, 10:23:00 AM EDT  

Blogger Joel Garry said....

I still think any device that has a rechargeable battery a USB connection should just be able to DO THIS - charge off of the USB port.

I agree. However, it would probably be better if you wouldn't blow 5 Amps into your XM radio USB port.

Fri Sep 22, 01:30:00 PM EDT  

Anonymous Tom Fox said....

I agree. However, it would probably be better if you wouldn't blow 5 Amps into your XM radio USB port.

I think you mean 0.5 amps. At any rate, that would be what it could supply, not necessarily what it is delivering. The current draw would be what the charging device or battery would pull from the USB port.

Verification: lrickl

Fri Sep 22, 03:15:00 PM EDT  

Blogger Thomas Kyte said....

amps - schmamaps...

you are talking to a person who took all of the electricity out in his apartment building one day installing a light dimmer (the sparks in my apartment were quite exciting)

I never got this hardware stuff under control.

I just want my batteries to charge, I don't care how it happens, should just be via the USB port

(by the way, that XM charging idea with the usb cable, doesn't work on all of them - doesn't work on mine, I used google extensively and tried them all.

Fri Sep 22, 03:20:00 PM EDT  

Blogger Joel Garry said....

I think you mean 0.5 amps

Nope, check the link again - "Though the upper limit specifies that the current never exceed 5A, but a wise designer should not rely on that[sic]. In any case, a
USB port can never be counted on to limit its output current to 500mA, or any amount near that. In fact, output current from a port often exceeds several Amps since multi-port systems (like PCs) frequently have only one protection device for all ports in the system. The protection device is set above the TOTAL power rating of all the ports."

The essence of this problem is the tug of war between cost and ubiquity. You have to account for people who leave their laptops with the Sony batteries charging under the bedsheets, people who take 220V fans into the bath, people who use rj-11 jacks for rs-232 connections, right next to telephones. Not only that, but stupid people too (as opposed to smart people who sometimes do stupid things - and, the real point here, people doing normal things and expecting everything to work correctly and safely). The USB standard itself doesn't fully account for all situations, and does allow for coffee warmers!?

It's certainly a reasonable wish to have everything work together. There just isn't any strong economic motivation for manufacturers to do so. And there's some strong motivation to do the opposite. Just ask the man who (insert favorite cynical example here - SQL extensions, Betamax, iPod, Zip drives, BlueRay etc.)

Sat Sep 23, 07:06:00 PM EDT  

Blogger Andreya said....

Hi Nice Blog .Setting the backlight to “always on” will significantly reduce your ipod batteries life. Only use the backlight when necessary.

Mon Aug 11, 01:07:00 AM EDT  


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