| Re: When 12 volts is not 9.6 volts
On Sat, 30 Dec 2006 15:36:27 -0500, dgk <sonice@zero-spam-hotmail.com>
may have said:
>So, why do some things work fine with 1.2, and others not?
An alkaline that delivers 1.5V unloaded may only be supplying 1.3V or
so under load due to internal resistance. The internal resistance of
the typical rechargeable is lower; its output maintains close to rated
voltage farther into the discharge cycle. If the device has a fairly
high drain level, the rechargeable may actually deliver a higher
voltage than the alkaline, but a device which loads alkalines to the
point that their output drops to that of a NiCd will also drain them
in a frustratingly short period of time. As a result, manufacturers
of battery-powered items tend to choose batteries that will maintain
the desired operational characteristics for an acceptable period...and
this means that the load is low enough that the delivered voltage of a
rechargeable typically still will not be as high as that of the
alkaline unit with the same physical form factor. Where the device is
voltage-sensitive, rechargeables may not work in place of alkalines.
>And why
>aren't rechargeables 1.5?
Chemistry.
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