I'm thinking of getting an HP TC1100 . I want to use it for perhaps 8h
..Without access to a mains plug.

Is it possible to get a few batteries and swap them once once each gets
used up?

or is there a better solution?

Hi,

jameshanley39******.co.uk schrieb:

> Is it possible to get a few batteries and swap them once once each gets
> used up?

Sure. You can buy additional batteries. In that case you should invest
some money in a Battery Adapter Kit for recharching batteries without
the tc1100.

Besim

--
Besim at Karadeniz dot de >> Pforzheim/GER >>> http://www.karadeniz.de/
netplanet - Verstehen Sie mal das Internet! - http://www.netplanet.org/
"In dir muss brennen, was du in anderen entzünden willst."
-- Augustinus (354-430), Kirchenlehrer

<jameshanley39******.co.uk> wrote in message
news:1167062803.386441.70030@i12g2000cwa.googlegro ups.com...
> I'm thinking of getting an HP TC1100 . I want to use it for perhaps 8h
> .Without access to a mains plug.
>
> Is it possible to get a few batteries and swap them once once each gets
> used up?
>
> or is there a better solution?
>

Under better solution, at least consider getting an external battery pack
that could be used with the wonderful tc1100 and other devices (reuse!).
This should also be economically viable, considering the tc1100 2.5-3hr run
time (slightly less if using 802.11 wireless ), which would require 3+
batteries for the 8hr run, depending on intended use.

Typical modern tablet PCs (especially slates in the 10.5 - 12" range) will
consume ~12 watts/hour. An external 130 watt power supply would deliver
130/12 = ~10 hours, then take away for the inherent loss from heat of the
conversion process to the required 16-19v (yes, battery places rate the
battery storage, not output, because the first number is higher), and you
end up with something close to your needed 8 hours - theoretically with a
margin if you start with a charged battery in the tablet. Personal Mileage
will vary, however.

For starters check here, although there are other solutions to be googled
for:

http://www.batterygeek.net/Batteryge...atterygeek.htm

xTenn wrote:
> <jameshanley39******.co.uk> wrote in message
> news:1167062803.386441.70030@i12g2000cwa.googlegro ups.com...
> > I'm thinking of getting an HP TC1100 . I want to use it for perhaps 8h
> > .Without access to a mains plug.
> >
> > Is it possible to get a few batteries and swap them once once each gets
> > used up?
> >
> > or is there a better solution?
> >
>
> Under better solution, at least consider getting an external battery pack
> that could be used with the wonderful tc1100 and other devices (reuse!).
> This should also be economically viable, considering the tc1100 2.5-3hr run
> time (slightly less if using 802.11 wireless ), which would require 3+
> batteries for the 8hr run, depending on intended use.
>
> Typical modern tablet PCs (especially slates in the 10.5 - 12" range) will
> consume ~12 watts/hour. An external 130 watt power supply would deliver
> 130/12 = ~10 hours, then take away for the inherent loss from heat of the
> conversion process to the required 16-19v (yes, battery places rate the
> battery storage, not output, because the first number is higher), and you
> end up with something close to your needed 8 hours - theoretically with a
> margin if you start with a charged battery in the tablet. Personal Mileage
> will vary, however.
>
> For starters check here, although there are other solutions to be googled
> for:
>
> http://www.batterygeek.net/Batteryge...atterygeek.htm



thanks, that's really useful..
Though since it's 14.8V, would I be better off "under doing" it

http://www.batterygeek.net/Batteryge...atterygeek.htm

Furthermore, that 15-21 external laptop battery, says it has a 16V/19V
selector switch. So if the tablet pc does 14.8 , that's giving it 1.2V
too much. (+ will that increased voltage increase processor
temperature? I don't want cpu fan speed to go up)

I notice that the 14-18 is more expensiev and less watts, so by your
calculation less hours. 118=12=9.8h
not bad though.. + as you say the power of the existing battery will
push that up further.

----useful info for tablet pc 1100----------
This link

http://h20000.www2.hp.com/bizsupport...eriesId=376810

Leads to this pdf
"HP Compaq tc1100 Tablet PC - Maintenance and Service Guide "

Sn extract from that pdf says

Stand-alone power requirements
Nominal operating voltage 14.8 VDC
Maximum operating power 40.0 W
Peak operating power 38.0 W

(P=IV, power = current & voltage. Cleraly current is <= 5V and the
adaptor at batterygeek site handles up to 5V and no more. So amps are
fine).

<jameshanley39******.co.uk> wrote in message
news:1167105962.932086.184310@h40g2000cwb.googlegr oups.com...
>
>
> thanks, that's really useful..
> Though since it's 14.8V, would I be better off "under doing" it
>


14.8v? My Ac adaptor for the TC1100 (part # 239427-001) is rated 18.5v...
Listed nominal operating voltages may not be taking into account charging
circuit design and/or tolerance?


>
> (P=IV, power = current & voltage. Cleraly current is <= 5V and the
> adaptor at batterygeek site handles up to 5V and no more.

I am not sure about the 5v limitation you refer to, since the adaptor
outputs we discussed here were in the 14 - 19v range. Maybe I misread?

Either way, one thing is certain - you have a lot of options to get your 8hr
run time. Just be sure to fudge a bit on the watt calculation. I typically
use rms values out of habit (.717), but anything is fine as long as you
don't use the battery company's wattage figures without a remaining reserve
capacity. But anyone who can quote ohm's law knows that. ;)

xTenn wrote:
> <jameshanley39******.co.uk> wrote in message
> news:1167105962.932086.184310@h40g2000cwb.googlegr oups.com...
> >
> >
> > thanks, that's really useful..
> > Though since it's 14.8V, would I be better off "under doing" it
> >
>
>
> 14.8v? My Ac adaptor for the TC1100 (part # 239427-001) is rated 18.5v...
> Listed nominal operating voltages may not be taking into account charging
> circuit design and/or tolerance?
>

thanks for pointing that out.. I saw an adaptor on ebay rated at 18.5V
as you say.

It's 18.5V 3.5A

incase anybodyis interested, it says it's compatible with the HP Tablet
TC1000 too, and some Compaq Presario models are listed.

>
> >
> > (P=IV, power = current & voltage. Cleraly current is <= 5V and the
> > adaptor at batterygeek site handles up to 5V and no more.
>
> I am not sure about the 5v limitation you refer to, since the adaptor
> outputs we discussed here were in the 14 - 19v range. Maybe I misread?
>

OH.... I mistyped
I wrote
"Clearly current is <= 5V " I meant <= 5A

maybe you read it as "Clearly voltage is.." ;-)

I used those wrong figures of 38/14.8 to get less than 5A. But
38/18.5 gives even less. Makes sense anyhow, adaptor is 3.5A



> Either way, one thing is certain - you have a lot of options to get your 8hr
> run time. Just be sure to fudge a bit on the watt calculation. I typically
> use rms values out of habit (.717), but anything is fine as long as you
> don't use the battery company's wattage figures without a remaining reserve
> capacity. But anyone who can quote ohm's law knows that. ;)

I don't know much about electricity..
So, how many volts would I use? 18.5V?
I read something along the lines of the RMS value being an average..
Should I use the RMS voltage? What is that value?

I'd have thought that the standard adaptor just uses 18.5V. So that's
what i suppose i'd use

jameshanley39******.co.uk shared these words of wisdom:

> thanks for pointing that out.. I saw an adaptor on ebay rated at
> 18.5V as you say.
>
> It's 18.5V 3.5A
>
> incase anybodyis interested, it says it's compatible with the HP
> Tablet TC1000 too, and some Compaq Presario models are listed.

Yes, the adapter is the same for the tc1000 and for tons of COMPAQ and
HP notebooks.
I'm using mine from the Armada M700, f.e.

Rainald