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Posted by SMS on 11/06/06 09:17
el_steak wrote:
> After seeing that, I simply soldered 2 pieces of wire from the (+) and
> (-) of the dead battery to the (+) and (-) of the main battery
> terminals. The player works fine now.
That's probably not a good idea. The lithium button cell is not designed
to be charged, or to have voltage applied directly to it. On computers,
there are two diodes that prevent the power supply +5V from trying to
charge the CMOS/RTC coin cell battery (required by UL/CSA/TUV) because
the Lithium battery can explode, and it's toxic.
I've gone up against UL on this issue, where we had the protection
circuitry inside the SuperIO where the CMOS and RTC resided, and they
made us give them the schematics of the internals of our chip to ensure
that there was really the protection circuit (they preferred discrete
components, but they let us get away with one external and one internal
diode).
What's strange is that the button cell would go dead. It's purely for
back-up when the regular battery is completely discharged (or removed
for replacement). The battery life of the button cell should be at least
10 years.
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