[EMAIL PROTECTED] wrote:
On Fri, Feb 17, 2006 at 01:05:21PM -0500, John M Flinchbaugh wrote:
On Fri, Feb 17, 2006 at 05:51:59PM +0000, john gennard wrote:
I've just recharged the battery which took just
over 23 minutes to reach 'fully charged'. Then switching
to it, in one minute I got 'Running off battery 11 mins
left' quickly followed by 'running out 0 mins left'.
Can anyone offer any suggestions (solice is perhaps
too much to hope for). I've never had anything to do with
Laptops before, so I'm in the dark.
When my R40's battery life slowly dropped from 4-5 hours to 1 hour, I
decided to recalibrate it by running it down completely, so it could
have a better idea how long it really could run.
Once the battery meter warned me that I had 0 minutes left, I rebooted
it to the LILO prompt, stopped it there and let it drain the battery
until it just died and couldn't be turned back on. I think it ran for
nearly another hour after initially reporting empty, so obviously it
was a bit out of calibration.
After a recharge, the battery meter more accurately reported that I
had 2 hours left. It was still degraded from original performance, but
I at least regained a little extra use before having to replace this
aging battery.
Yeah. I've heard elsewhere that some kinds of batteries (those with
"battery memory", like NiCads) can be rejuvenated by completely draining
NiCd cells do not have "memory". I'd be quite surprised to hear that
he has NiCd cells in there, anyway. NiMH technology has displaced
NiCd completely for laptops, AFAICT.
them. Apparently they remember the point to which they have been
discharged last and start to act empty when they get back to that point.
Other kinds of batteries (like lead-acid car batteries can be damaged
severely by discharging them completely. And I've heard that the MiMH
batteries don't have a battery memory problem at all.
Pb acid cells can indeed be seriously damaged by discharging them, but
they can also be repaired. It takes a lot of time, but such a cell
can be unsulphated. It takes special equipment.
Mike
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