Discussion:
Laptop battery life
(too old to reply)
Jim
2010-08-06 19:08:09 UTC
Permalink
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
zippybear
2010-08-06 19:10:02 UTC
Permalink
How many hours should a new 11.1V 48Wh  Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Jim
2010-08-06 20:02:42 UTC
Permalink
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"

So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Dave
2010-08-06 20:08:33 UTC
Permalink
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Jim
2010-08-06 21:30:27 UTC
Permalink
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
David
2010-08-06 22:30:50 UTC
Permalink
Why do you assume answers like this are simple?

Your laptop will have multiple "settings" for power consumption. The lower you
set it, the longer the battery will last.... but there are many, many other
variables.

Many brand new laptops that are designed for home use have very short battery
life... that sacrifice that to provide a faster machine, with larger screen and
better video card.... I have seen new laptops with a spec that says under 2
hours... so in the real world, that's likely 1 hour or a bit more.

If you have a 17" laptop with a powerful video card, you may be seeing 90mins
or so... that would be not surprising to me for constant use. Even less if you
are doing CPU and/or video intensive stuff...

What is the model/specs of the laptop? Even just the CPU, Video Card and
screen size will be enough for me to give you an estimate... without that its
like asking how long a 9-volt will last without knowing what item it is
powering....


David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Jim
2010-08-06 22:33:06 UTC
Permalink
All I wanted was something like 1 hour, 1 day, 17 years, etc...

Forget I asked anything ever in this group.
Post by David
Why do you assume answers like this are simple?
Your laptop will have multiple "settings" for power consumption. The
lower you set it, the longer the battery will last.... but there are many,
many other variables.
Many brand new laptops that are designed for home use have very short
battery life... that sacrifice that to provide a faster machine, with
larger screen and better video card.... I have seen new laptops with a
spec that says under 2 hours... so in the real world, that's likely 1 hour
or a bit more.
If you have a 17" laptop with a powerful video card, you may be seeing
90mins or so... that would be not surprising to me for constant use. Even
less if you are doing CPU and/or video intensive stuff...
What is the model/specs of the laptop? Even just the CPU, Video Card and
screen size will be enough for me to give you an estimate... without that
its like asking how long a 9-volt will last without knowing what item it
is powering....
David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
David
2010-08-06 22:35:25 UTC
Permalink
You didn't provide enough information to answer the question.
If you do not want to provide it, fine... you will not get a reasonable answer.

The answer could be anywhere from 4 hours to 1 hour...

David
Post by Jim
All I wanted was something like 1 hour, 1 day, 17 years, etc...
Forget I asked anything ever in this group.
Post by David
Why do you assume answers like this are simple?
Your laptop will have multiple "settings" for power consumption. The lower
you set it, the longer the battery will last.... but there are many, many
other variables.
Many brand new laptops that are designed for home use have very short
battery life... that sacrifice that to provide a faster machine, with larger
screen and better video card.... I have seen new laptops with a spec that
says under 2 hours... so in the real world, that's likely 1 hour or a bit
more.
If you have a 17" laptop with a powerful video card, you may be seeing
90mins or so... that would be not surprising to me for constant use. Even
less if you are doing CPU and/or video intensive stuff...
What is the model/specs of the laptop? Even just the CPU, Video Card and
screen size will be enough for me to give you an estimate... without that
its like asking how long a 9-volt will last without knowing what item it is
powering....
David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Jim
2010-08-06 23:02:07 UTC
Permalink
See..that's ALL I wanted...between 4 and 1 hours.
I didn't expect a time frame narrowed down to the second.
My laptop falls into the 4-1 hours so I know my laptop is fine.
Having never used one before, I assumed battery life would be in the 10-15
hour range.

When I first got it, I had it plugged in. The battery light was off so I
unplugged it.
Then I found the single 4" square sheet of paper tucked away telling me to
charge
the battery for 12 hours on the first charge and thought I may have
shortened the
battery's life/charge. It now appears that I didn't.
Post by David
You didn't provide enough information to answer the question.
If you do not want to provide it, fine... you will not get a reasonable answer.
The answer could be anywhere from 4 hours to 1 hour...
David
Post by Jim
All I wanted was something like 1 hour, 1 day, 17 years, etc...
Forget I asked anything ever in this group.
Post by David
Why do you assume answers like this are simple?
Your laptop will have multiple "settings" for power consumption. The
lower you set it, the longer the battery will last.... but there are
many, many other variables.
Many brand new laptops that are designed for home use have very short
battery life... that sacrifice that to provide a faster machine, with
larger screen and better video card.... I have seen new laptops with a
spec that says under 2 hours... so in the real world, that's likely 1
hour or a bit more.
If you have a 17" laptop with a powerful video card, you may be seeing
90mins or so... that would be not surprising to me for constant use.
Even less if you are doing CPU and/or video intensive stuff...
What is the model/specs of the laptop? Even just the CPU, Video Card
and screen size will be enough for me to give you an estimate... without
that its like asking how long a 9-volt will last without knowing what
item it is powering....
David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Billy
2010-08-06 22:48:56 UTC
Permalink
See, still acting like an idiot!
Post by Jim
All I wanted was something like 1 hour, 1 day, 17 years, etc...
Forget I asked anything ever in this group.
Post by David
Why do you assume answers like this are simple?
Your laptop will have multiple "settings" for power consumption. The
lower you set it, the longer the battery will last.... but there are
many, many other variables.
Many brand new laptops that are designed for home use have very short
battery life... that sacrifice that to provide a faster machine, with
larger screen and better video card.... I have seen new laptops with
a spec that says under 2 hours... so in the real world, that's likely
1 hour or a bit more.
If you have a 17" laptop with a powerful video card, you may be seeing
90mins or so... that would be not surprising to me for constant use.
Even less if you are doing CPU and/or video intensive stuff...
What is the model/specs of the laptop? Even just the CPU, Video Card
and screen size will be enough for me to give you an estimate...
without that its like asking how long a 9-volt will last without
knowing what item it is powering....
David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a >
laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Jim
2010-08-06 23:03:26 UTC
Permalink
If I'm an idiot, wouldn't reading my posts make you an even bigger idiot?
When I discover someone is an idiot, I put them in my ignore pile...which is
where you will be when you get this.

Enjoy.
Post by Billy
See, still acting like an idiot!
Post by Jim
All I wanted was something like 1 hour, 1 day, 17 years, etc...
Forget I asked anything ever in this group.
Post by David
Why do you assume answers like this are simple?
Your laptop will have multiple "settings" for power consumption. The
lower you set it, the longer the battery will last.... but there are
many, many other variables.
Many brand new laptops that are designed for home use have very short
battery life... that sacrifice that to provide a faster machine, with
larger screen and better video card.... I have seen new laptops with a
spec that says under 2 hours... so in the real world, that's likely 1
hour or a bit more.
If you have a 17" laptop with a powerful video card, you may be seeing
90mins or so... that would be not surprising to me for constant use.
Even less if you are doing CPU and/or video intensive stuff...
What is the model/specs of the laptop? Even just the CPU, Video Card
and screen size will be enough for me to give you an estimate... without
that its like asking how long a 9-volt will last without knowing what
item it is powering....
David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a >
laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Billy
2010-08-07 10:28:35 UTC
Permalink
I read everything, even stuff from idiots! Your that stun that you even
forgot you put me in that file a few weeks ago...lol....what a maroon!!!
Post by Jim
If I'm an idiot, wouldn't reading my posts make you an even bigger idiot?
When I discover someone is an idiot, I put them in my ignore
pile...which is where you will be when you get this.
Enjoy.
Post by Billy
See, still acting like an idiot!
Post by Jim
All I wanted was something like 1 hour, 1 day, 17 years, etc...
Forget I asked anything ever in this group.
Post by David
Why do you assume answers like this are simple?
Your laptop will have multiple "settings" for power consumption.
The lower you set it, the longer the battery will last.... but there
are many, many other variables.
Many brand new laptops that are designed for home use have very
short battery life... that sacrifice that to provide a faster
machine, with larger screen and better video card.... I have seen
new laptops with a spec that says under 2 hours... so in the real
world, that's likely 1 hour or a bit more.
If you have a 17" laptop with a powerful video card, you may be
seeing 90mins or so... that would be not surprising to me for
constant use. Even less if you are doing CPU and/or video intensive
stuff...
What is the model/specs of the laptop? Even just the CPU, Video
Card and screen size will be enough for me to give you an
estimate... without that its like asking how long a 9-volt will last
without knowing what item it is powering....
David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a >
laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
clouddreamer
2010-08-06 22:51:18 UTC
Permalink
Post by Jim
All I wanted was something like 1 hour, 1 day, 17 years, etc...
Given those parameters, I have averaged about 2 to 3 hours with most of
my batteries when they were fairly new.

On my little netbook, an Acer Aspire, I got just over 2 hours typing in
Word, surfing and sending emails the one time I used it on batteries.

You can buy battery packs that are advertised to last like 9 hours. The
ones I've seen stick out from the back of the computer.

..
James
2010-08-11 12:12:29 UTC
Permalink
FYI I have two laptops at home, one a 17" desktop-replacement beast that
gets 1.5 hours MAX on a fully charged battery. The other is a 13"
lightweight unit designed for portability and power savings, I can get
almost 11 hours per charge on that machine.

You really need to provide more information on your laptop if you want
an estimate, it will vary widely based on your machine.
Post by Jim
All I wanted was something like 1 hour, 1 day, 17 years, etc...
Forget I asked anything ever in this group.
Post by David
Why do you assume answers like this are simple?
Your laptop will have multiple "settings" for power consumption. The
lower you set it, the longer the battery will last.... but there are
many, many other variables.
Many brand new laptops that are designed for home use have very short
battery life... that sacrifice that to provide a faster machine, with
larger screen and better video card.... I have seen new laptops with a
spec that says under 2 hours... so in the real world, that's likely 1
hour or a bit more.
If you have a 17" laptop with a powerful video card, you may be seeing
90mins or so... that would be not surprising to me for constant use.
Even less if you are doing CPU and/or video intensive stuff...
What is the model/specs of the laptop? Even just the CPU, Video Card
and screen size will be enough for me to give you an estimate...
without that its like asking how long a 9-volt will last without
knowing what item it is powering....
David.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a >
laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Carter
2010-08-07 00:23:03 UTC
Permalink
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a
simple answer
LOL! The problem is that the question is not simple. There are
too many variables to give a simple answer to it.

Carter
Jim
2010-08-07 00:29:48 UTC
Permalink
But someone did give me a simple answer....4 to 1 hours
That's all I needed

If someone asked what the mileage of a 2009 Ford Ranger is would you ask if
the Ranger has a tonneau cover,
after market tires and exhaust, if the driver is 120 pounds or 350 pounds,
if it's raining, snowing or sunny while driving.
If they're driving uphill or downhill all the way..if their radio is on or
off, if they are towing a trailer, etc....

Probably not...but a lot of those factors would change the mileage, wouldn't
it?
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
LOL! The problem is that the question is not simple. There are too many
variables to give a simple answer to it.
Carter
Carter
2010-08-07 00:49:06 UTC
Permalink
Post by Jim
But someone did give me a simple answer....4 to 1 hours
That's all I needed
That's a non answer. You could have guessed that yourself. One
makes an assumption here that if someone asks such a question he
is looking for a reasonably accurate answer. You didn't get one.
Post by Jim
If someone asked what the mileage of a 2009 Ford Ranger is would
you ask if the Ranger has a tonneau cover,
after market tires and exhaust, if the driver is 120 pounds or
350 pounds, if it's raining, snowing or sunny while driving.
If they're driving uphill or downhill all the way..if their radio
is on or off, if they are towing a trailer, etc....
Probably not...but a lot of those factors would change the
mileage, wouldn't it?
Yes, I would ask about many of those variables. Probably not the
tonneau cover or radio though. :^)

Carter
Jim
2010-08-07 02:23:37 UTC
Permalink
No I wouldn't have guessed 4 hours and I definitely wouldn't guess 1 hour as
I
never used a laptop before and had no idea how long they're supposed to
last.
Post by Jim
But someone did give me a simple answer....4 to 1 hours
That's all I needed
That's a non answer. You could have guessed that yourself. One makes an
assumption here that if someone asks such a question he is looking for a
reasonably accurate answer. You didn't get one.
Post by Jim
If someone asked what the mileage of a 2009 Ford Ranger is would
you ask if the Ranger has a tonneau cover,
after market tires and exhaust, if the driver is 120 pounds or
350 pounds, if it's raining, snowing or sunny while driving.
If they're driving uphill or downhill all the way..if their radio
is on or off, if they are towing a trailer, etc....
Probably not...but a lot of those factors would change the
mileage, wouldn't it?
Yes, I would ask about many of those variables. Probably not the tonneau
cover or radio though. :^)
Carter
Dave
2010-08-07 03:11:44 UTC
Permalink
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Your welcome. I couldn't make it any simpler. Sorry for trying to help.
Jim
2010-08-07 12:29:47 UTC
Permalink
A simple answer would have been "anywhere from 4 -1 hours depending on your
laptop, it's hardware and it's battery"

See...simple answer.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Your welcome. I couldn't make it any simpler. Sorry for trying to help.
nospam
2010-08-07 17:38:59 UTC
Permalink
ooh----gawd!!
Post by Jim
A simple answer would have been "anywhere from 4 -1 hours depending on
your laptop, it's hardware and it's battery"
See...simple answer.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Your welcome. I couldn't make it any simpler. Sorry for trying to help.
duende
2010-08-08 16:17:29 UTC
Permalink
Post by Jim
A simple answer would have been "anywhere from 4 -1 hours depending on your
laptop, it's hardware and it's battery"
See...simple answer.
Post by Jim
*sigh*
Why would I ever think I could ask a simple question and get a simple answer
Post by Jim
It doesn't tell me the battery life.
It says "battery operating time varies depending on operating conditions"
So....I know the battery will last longer if the laptop is turned off or
hibernating
but how long should it last under constant use.
How many hours should a new 11.1V 48Wh Li-ion battery last (in a laptop
that is turned on) after being fully charged?
Look at what the manual says... divide by 2 :-)
Its a 48 watt/hour battery. That means it will put out 48 watts for 1
hour. or 24 watts for 2 hours etc. You need to know the power
consumption of your notebook.
Your welcome. I couldn't make it any simpler. Sorry for trying to help.
Ask stupid, vague question with little to no details, you get non-
helpful answers.

If you just wanted a random vague answer, why not just google it?
Coleman
2010-08-11 12:06:12 UTC
Permalink
Well there is somewhat of a straight forward answer on this, but the
varies by manufacture

depending on your battery type 6 or 9 cell you can expect to get
anywhere from 3 to 6 hours out of your battery. most manufactures
also spec these times based on your laptop using the most conservative
power settings.

but over time, your battery will lose power and suggested run times
will be significantly less. When i first got my dell with a 9cell
battery 5 years ago, i could get almost 5 hours on medium power
settings. but now, on low, i am lucky to get 30 mins.

The times will vary by manufacture as they all use different
batteries. I believe that sony and dell both use the same battery
manufacture.


hope this helps
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