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- Posted on
November 26, 2005, 11:26 am
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I've got a brand new Dell Inspiron 6000 laptop with a 80 Wh 9-cell
Li-ion battery. Most of the time it sits on the table in my living room
with ready access to a power plug. My old laptop (also a Dell) I used
to keep plugged in all the time. However after 2 years or so the old
laptop would only run for 15 minutes or so off the battery. Since I
would like to keep my new battery in better health, for those times
when I do want to run the laptop away from a power plug such as when
travelling, I now have the following question:
Which is better for a laptop battery:
1) AC adapter always plugged in - battery keeps fully charged all the
2) repeatedly charging the battery - running laptop off battery -
recharging again when battery is nearly empty (deep cycling)
Personally I thought continuous deep cycling would be worse for battery
lifetime (that is what most battery datasheets seem to imply anyway),
but after my experience with my previous laptop I am not so sure
Thanks for your insights/experiences on this issue.
- The Electric Fan Club
November 30, 2005, 11:14 am
Re: which is better for battery: plugged or unplugged?
Theoretically, Li-ion batteries should be perfectly OK left in a Laptop
connected to the AC.
Having said that: anecdotal evidence would suggest otherwise. My own view
on this is that electrically, the Li-ion battery will not overcharge (they
explode if you even try). The problem is most likely that the laptop gets
warm and transfers this heat to the battery. Current Li-ion batteries
cannot tolerate even moderate amonts of heat. Keeping the battery in a
refrigerator will quadruple its life.