Running IBM Thinkpad R50e off 12 volts

[Follow-up set to comp.sys.laptops.thinkpad]
On 24 Aug 2009 17:26:17 GMT, Ed <Huckleberry_REMOVE_@bigvalley.net>
wrote in <Xns9C716A2A38695Huckleberrybigvalley@74.209.136.8 8>:

>> FYI - I have a Thinkpad R52 and the adapter output is 16 VDC and 4.5
>> AMP
>
> That's why I hesitated to try my 3A max adapter. However, one must
>realize that Thinkpad's 4.5 A is designed to both run the laptop and
>charge the battery at the same time.. which still leaves the question of
>how much the Thinkpad alone draws.

Pretty easy to calculate from battery capacity and run time.

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On Tue, 25 Aug 2009 07:33:51 -0700, John Navas <spamfilter1@navasgroup.com>
wrote:

> [Follow-up set to comp.sys.laptops.thinkpad]
> On 24 Aug 2009 17:26:17 GMT, Ed <Huckleberry_REMOVE_@bigvalley.net>
> wrote in <Xns9C716A2A38695Huckleberrybigvalley@74.209.136.8 8>:
>
>>> FYI - I have a Thinkpad R52 and the adapter output is 16 VDC and 4.5
>>> AMP
>>
>> That's why I hesitated to try my 3A max adapter. However, one must
>> realize that Thinkpad's 4.5 A is designed to both run the laptop and
>> charge the battery at the same time.. which still leaves the question of
>> how much the Thinkpad alone draws.
>
> Pretty easy to calculate from battery capacity and run time.

Really easy and really wrong if one assumes that the capacity of a used
battery is equal to what the manufacturer claims for a new one or that the
computer runs until no charge remains.

Tony

>>> FYI - I have a Thinkpad R52 and the adapter output is 16 VDC and 4.5
>>> AMP
>>
>> That's why I hesitated to try my 3A max adapter. However, one must
>>realize that Thinkpad's 4.5 A is designed to both run the laptop and
>>charge the battery at the same time.. which still leaves the question
of
>>how much the Thinkpad alone draws.
>
> Pretty easy to calculate from battery capacity and run time.


Ahhh... now I gotta go look up new IBM bat. capacity, or pull mine to
refresh my memory. In any case, I suspect you are alluding to the
computer draw being less than 3A.... and I agree.

Ed



..

>>
>> Pretty easy to calculate from battery capacity and run time.
>
> Really easy and really wrong if one assumes that the capacity of a
> used battery is equal to what the manufacturer claims for a new one or
> that the computer runs until no charge remains.
>
> Tony


When my computer was new or 4 years ago, I got almost 4 hours run
time. That would be the figure I use to calculate current consumption
rate.


Ed

On Aug 25, 6:28*pm, Ed <Huckleberry_REMO...@bigvalley.net> wrote:
> >> Pretty easy to calculate from battery capacity and run time. *
>
> > Really easy and really wrong if one assumes that the capacity of a
> > used battery is equal to what the manufacturer claims for a new one or
> > that the computer runs until no charge remains.
>
> > Tony
>
> * * When my computer was new *or 4 years ago, *I got almost 4 hours run
> time. * That would be the figure I use to calculate current consumption
> rate.
>
> * Ed

If you pull the battery and use the LT...you'll probably use less than
1 amp.

[Follow-up set to comp.sys.laptops.thinkpad]
On Tue, 25 Aug 2009 16:23:26 +0100, "Anthony R. Gold"
<not-for-mail@ahjg.co.uk> wrote in
<m40895pu4v03r23ulrulfq7fkmu23cl34t@4ax.com>:

>On Tue, 25 Aug 2009 07:33:51 -0700, John Navas <spamfilter1@navasgroup.com>
>wrote:
>
>> [Follow-up set to comp.sys.laptops.thinkpad]
>> On 24 Aug 2009 17:26:17 GMT, Ed <Huckleberry_REMOVE_@bigvalley.net>
>> wrote in <Xns9C716A2A38695Huckleberrybigvalley@74.209.136.8 8>:
>>
>>>> FYI - I have a Thinkpad R52 and the adapter output is 16 VDC and 4.5
>>>> AMP
>>>
>>> That's why I hesitated to try my 3A max adapter. However, one must
>>> realize that Thinkpad's 4.5 A is designed to both run the laptop and
>>> charge the battery at the same time.. which still leaves the question of
>>> how much the Thinkpad alone draws.
>>
>> Pretty easy to calculate from battery capacity and run time.
>
>Really easy and really wrong if one assumes that the capacity of a used
>battery is equal to what the manufacturer claims for a new one or that the
>computer runs until no charge remains.

Battery Information on fairly recent ThinkPads gives the remaining
battery capacity.

--
Best regards, You are cordially invited to participate in the
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