| Mr Physics 2007-05-29, 10:33 am |
| Ron Hunter wrote:
> sarah bennett wrote:
>
> My wife and I both have Motorola RAZR phones, and the Bluetooth
> headsets. Each unit came with the same type of recharger, so we have 4
> of them, and a 'car cord'. When we travel, we take two along, and the
> 'car cord' of course. Seems to me if they sold the units without the
> charger, it would make better sense, and if they could be charged from
> my laptop/desktop USB connections, I could dispense with chargers
> completely, but there is no option to not get the additional chargers.
> I suspect it is cheaper from the manufacturer's point of view to include
> the charger (VERY cheap) rather than to maintain two different packages.
It would be an error to assume that all 'USB' chargers or power sources
are the same. The charger for my Motorola Razr will not charge either my
wife's Blackberry or my GPSMap60cx. 5V power and a common connector do
not a standard make, unfortunately. As far as I can tell, the best that
can be said about this is that mixing and matching chargers will
probably not harm charger or device. I seem to remember reading that
this is a result of certain pins other than +5V and GND on the USB link
being held, high, low, or left to float to tell the device that it
should be in charge mode. Sometimes engineers are too smart for our own
good.
Greg
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