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Anonymous   05-09-2004 at 07:27:17 AM

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

 

The IBM web site claims I can replace the old 10.8v battery in my x22
laptop with a 14.4v battery (FRUs are 02k6758 and 02k6651, respectively).

Is it possible that a laptop can run at such wildly different voltages
or is it likely a data capture error?

Another problem is that the original battery is rated at 4000mAh while
the new one is rated at 3600mAh. Would this mean a shorter battery life?

Anyone with experience doing this switch?


--
Alex Lopez-Ortiz alopez-o@uwaterloo.ca
http://db.uwaterloo.ca/~alopez-o Assistant Professor
School of Computer Science University of Waterloo

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Anonymous   05-09-2004 at 07:48:06 AM
- 0 +

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

 

Check the battery types on the batteries. My Thinkpad uses a 9.6 volt Ni-Mh
battery or a 14.4 volt Li-Ion battery. They are interchangeable and the
laptop senses which is installed. The Li-Ion lasts about 50% longer......


"Alex Lopez-Ortiz" <alopez-o@softbase.math.uwaterloo.ca> wrote in message
news:c7k1dl$mau$1@rumours.uwaterloo.ca...
>
> The IBM web site claims I can replace the old 10.8v battery in my x22
> laptop with a 14.4v battery (FRUs are 02k6758 and 02k6651, respectively).
>
> Is it possible that a laptop can run at such wildly different voltages
> or is it likely a data capture error?
>
> Another problem is that the original battery is rated at 4000mAh while
> the new one is rated at 3600mAh. Would this mean a shorter battery life?
>
> Anyone with experience doing this switch?
>
>
> --
> Alex Lopez-Ortiz alopez-o@uwaterloo.ca
> http://db.uwaterloo.ca/~alopez-o Assistant Professor
> School of Computer Science University of Waterloo

Reply to Anonymous
Anonymous   05-09-2004 at 04:43:24 PM
- 0 +

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

 

Amps and volts are tied together to make watts (what you actually use to
produce pictures and sound). so 10.8V at 4000mAh = 43 watts
but 14.4V at 3600 mAh = 52 watts

And depending on how your computer power supply is designed, it can take any
range of input voltage. Also depending on how it's designed it may be less
efficient at higher input voltages so some of the extra power from the newer
battery may be wasted as heat... but then again it may not.. depends on the
design.

Al...


"Alex Lopez-Ortiz" <alopez-o@softbase.math.uwaterloo.ca> wrote in message
news:c7k1dl$mau$1@rumours.uwaterloo.ca...
>
> The IBM web site claims I can replace the old 10.8v battery in my x22
> laptop with a 14.4v battery (FRUs are 02k6758 and 02k6651, respectively).
>
> Is it possible that a laptop can run at such wildly different voltages
> or is it likely a data capture error?
>
> Another problem is that the original battery is rated at 4000mAh while
> the new one is rated at 3600mAh. Would this mean a shorter battery life?
>
> Anyone with experience doing this switch?
>
>
> --
> Alex Lopez-Ortiz alopez-o@uwaterloo.ca
> http://db.uwaterloo.ca/~alopez-o Assistant Professor
> School of Computer Science University of Waterloo

Reply to Anonymous
Anonymous   05-10-2004 at 07:40:49 AM
- 0 +

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

 

No experinence with the switch, per se.

But it's not impossible.

The battery in a laptop is the input to a rather complex, multi-output
switching power supply. Many of these are wildly indifferent to their
input voltages, for example many of them will run off of 120 or 240
volts with no switching.

As for current capacity, 14 volts at 3600 mah is more POWER than 10
volts at 4000 mah. Watts (power) = voltage x current, and the increase
in voltage more than offsets the decrease in current capacity.


Alex Lopez-Ortiz wrote:
> The IBM web site claims I can replace the old 10.8v battery in my x22
> laptop with a 14.4v battery (FRUs are 02k6758 and 02k6651, respectively).
>
> Is it possible that a laptop can run at such wildly different voltages
> or is it likely a data capture error?
>
> Another problem is that the original battery is rated at 4000mAh while
> the new one is rated at 3600mAh. Would this mean a shorter battery life?
>
> Anyone with experience doing this switch?
>
>

Reply to Anonymous
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