Battery in or out when on A/C?

[Guest]

Archived from groups: comp.sys.laptops (More info?)

Re:
>
> Now how is it that the UPS battery will hold up in this service but the
> laptop battery won't? Seems to me you're trading one battery replacement
> for another. And it all strikes me as cheap for the sake of cheap.
>

First, the UPS battery is lead-acid, the laptop battery is lithium ion.
They have completely and totally different chemistries and
characteristics. The lead-acid battery will last for several years in
this type of service.

Second, the UPS battery costs about $12, while the Laptop battery costs
over $200. So if you were "trading one battery replacement for
another", that's still perfectly fine. Note, however, while the
capacities of the two batteries are the same, the lead-acid battery
weighs about 10x more than than the Lithium battery. In fact, when
replacing the lead-acid battery, the shipping cost can be more than the
cost of the battery itself.

All batteries are no more similar than are all cars; a Yugo and a Lexus
are not comparable.

 

[Guest]

Archived from groups: comp.sys.laptops (More info?)

Re:


>
> However, won;t running without the notebook battery cause the notebook
> battery to discharge?
> If left out long enough, you might not even be able to recharge the notebook
> battery.
>

Not really a concern. The battery can be put back into the notebook and
"topped off" every 90 to 120 days (which will probably happen by itself
if the notebook ever does any actual travling involving portable
operation). Some sites recommend that Lithium batteries are best stored
at 40% to 60% charge, others say full charge, with "top off" at about 90
to 120 days.

However, there was a thousands-of-posts long thread on this subject
[here] about 18 months ago, and the overwhelming consensus of actual
users was that leaving the battery in the laptop will essentially
destroy it in 6 to 18 months, while many Lithium batteries that do not
experience such use will last the better part of a decade (I have not
one but several Toshiba "2487" lithium batteries made in 1997 that are
still in good enough condition to run a laptop for 2 hours).

 

[Guest]

Archived from groups: comp.sys.laptops (More info?)

mha@TheWorld.com (Martha H Adams) wrote:

>Namely, seems to me it makes *lots* of sense to run your laptop from a
>UPS, no battery, if it's going to be in one place for a while.

Pardon if I jump in here, I just joined this ng.

With regards to your battery question I'd like to point out that it's
not only a battery issue. Some laptops, especially older designs, use
the battery as sort of a regulator! It stabilizes the voltage coming
in from the external source connector.

If a battery is out of the laptop, the voltage could possibly exceed
some design criteria.

Bottom line - it depends on how the laptop was designed.

Just my past experience ...

-=tom=-