--- Andrew Kershaw <[EMAIL PROTECTED]> wrote:
> >The "VL" prefix means rechargable. The "CR" prefix means primary
> >(non-rechargable).
> Is that right?  Well rats.
> 
> So my new batteries are going to bite the dust pretty quickly, then, 
> I'm betting.  How long do you think they'd last?
> 

It is hard to say how long they would last as a primary battery is not
intended to receive a charge. The powerbooks charge their PRAM
batteries with a trickle charge. Who know how long the non-rechargable
can take that.

The reason that powerbook PRAM batteries are rechargable is this: They
get a very heavy load put on them when you put the computer to Sleep
and swap out the main battery (AC not connected). This is a feature of
the Mac Powerbook, swapping the main battery in Sleep mode instead of
having to Shut Down, swap, then Restart. But this uses a lot of the
PRAM batteries power because it is not only keeping PRAM settings alive
but also RAM when it is Sleeping with no main battery or AC power.

Apple says to expect a good PRAM battery to keep RAM alive (in Sleep
mode) for about 4 minutes. In otherwords, your PRAM battery is depleted
in 4 minutes if it is powering RAM during Sleep. But, it gets recharged
(takes many hours) as soon as you get the new main battery slide in or
as soon as you apply the AC power adapter.

Greg

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