battery status LED's on C610 / 75UYF

I'm charging the battery, but it's not holding for a long time -
When I press the button on the battery -
75UYF - with 3800mah
how many of the led's should light up ??
tnx - Phil -

 

they should all light if fully charged. if partially charged then a
continuous row of lights show the level. if only every other light turns on
then the battery is defective. batteries do not last for much more than a
year. often shorter when heavily used. even with a 3 year warranty on a
system the battery never has more than just one year of warranty. it is
considered a consumable.

 

Which raises another question : )

I understand that battery life is more related to recharge cycles than
years. For example, the batteries in my seldom used and thus seldom
recharged Sony camcorder are over 5 years old and show no signs of
degradation.

Now and then I see manufacturer's instructions advising me not to recharge
batteries until an indicator shows I've reached 20% or less remaining
capacity.

As a result, I've pulled the batteries from my laptop which almost always is
connected to its AC adapter/charger. Does this make sense? It'll take a
long time to tell : )

 

i certainly oversimplify the issue by saying that these batteries do not
last more than a year. it depends on the specific battery technology, the
specific battery (two models offered by dell for the latitude c610), and the
way it is used.

 

I'm sure it varies by chemistry.

I read one study that concluded that shallower discharge gives more
cycles. BUT, if you multiply depth of discharge by number of cycles,
you get a number that's nearly constant. Stated another way, the total
amount of enerby delivered over the life of the cell was pretty much
constant.

Another study concluded that the life of cells depended on the time on
charge. They concluded that occasional fast charge was much better than
continuous trickle charge. Not sure if that applies in normal cycle
use, 'cause you can't wait for slow charge anyway.

mike

--
Bunch of stuff For Sale and Wanted at the link below.
laptops and parts Test Equipment
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TEK Sampling Sweep Plugin and RM564
Tek 2465 $800, ham radio, 30pS pulser
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http://www.geocities.com/SiliconValley/Monitor/4710/

 

well - fully charged - a couple of times -
all the LEDs are lit -
but it's only lasting about an hour - then done

 

you could confirm your power management scheme to try to extend battery life
as much as possible (black out display and shut of disks in 3 mins of
inactivity, dime lcd when on battery, etc), but even new, i don't think
these ever lasted more than two hours on battery. for extended use you
could use a second battery in the modular drive bay, but, of course, that
also adds weight.