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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Accessories (https://talk.maemo.org/forumdisplay.php?f=17)
-   -   External battery pack for N8x0/770. (https://talk.maemo.org/showthread.php?t=14139)

L0cutus 2008-06-13 22:45
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by Benson (Post 191744)
8 * 1.2V (assuming NiCd/NiMH voltage) is 9.6 V; that, one silicon (i.e. normal rectifier) diode, and a ~9 Ohm resistor of appropriate power rating should yield a workable power supply, which will fall inside the Nokia specifications (for I-V characteristic at least).
8 * 1.5V, OTOH, is 12 V; the maximum voltage permitted is 9.3V, so this would be outside the charger spec and potentially harmful to the device.
Edit: Oh, and your calculation is wrong; the capacity in Ah is the same as for one cell, since you connected them in series. You don't pick up any by reducing the voltage with passive elements; the extra energy dumps as heat, so make sure your resistor is rated for the resulting power. (9W, if I calculate right...)
so it is better to use a 'double 6AA holder' (2x http://tinyurl.com/4lon93)
6x1.2v=7.2v - 0.4v (diode 1n4002) = 6.8v / 0.800A ~= 8.5 ohm and 5.44W power to dissipate, this for the two packs, so we have a power of 2000+2000mAh = 4000mAh not bad i think, sorry for my bad english and VERY poor electronic knowledge ;)

Red 2008-06-24 08:25
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by AbelMN (Post 165158)
I bought the Philips in a Media Markt (400 shop in Urop).Don't know about the UK.

It's part of the "Philips power2go" range. I also don't see it anymore in the US / UK Amazon.

Succes, Abel.

There is one of these on ibood today at £22.35
ibood.com

luca 2008-06-24 20:09
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by Red (Post 194838)
There is one of these on ibood today at £22.35
ibood.com
The spec says 350mA, is that enough to charge the tablet?

JustNick 2008-07-18 13:20
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by Benson (Post 191744)
8 * 1.2V (assuming NiCd/NiMH voltage) is 9.6 V; that, one silicon (i.e. normal rectifier) diode, and a ~9 Ohm resistor of appropriate power rating should yield a workable power supply, which will fall inside the Nokia specifications (for I-V characteristic at least).

8 * 1.5V, OTOH, is 12 V; the maximum voltage permitted is 9.3V, so this would be outside the charger spec and potentially harmful to the device.
The N8x0 charger is rated 5.7V@800mA (when load connected), the best solution for a DIYer would be a step-up switching regulator with an output fixed at 6V@1A using 2 to 4 NiMh cells with a capacity not smaller than 2500mAh.
At 80% efficiency should be enough for 2 full battery charges with the device turned off or it could keep the device powered on for 5 hours (with wifi enabled and continued use) still being enough lightweight to carry around (4 NiMh are 106g according to my kitchen scales)

At least this is what I'm trying to build... man I wish I could work with SMD technology :D

avigodner 2008-08-01 20:55
Re: External battery pack for N8x0/770.
 
I just ordered on ebay. Seems not a bad deal
http://cgi.ebay.com/ws/eBayISAPI.dll...m=170245231787

lesterking214 2011-08-31 18:33
Re: External battery pack for N8x0/770.
 
I don't have a lot knowledge about this but I found a link that I hope can help you with this problem. Here is the link, cell phone accessories Your thread is really helpful. I hope your problem will now be fixed.

stefan0124 2014-06-24 11:52
Re: External battery pack for N8x0/770.
 
so old mobile phone.

endsormeans 2014-06-24 13:13
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by stefan0124 (Post 1430840)
so old mobile phone.
If the n8x0 device line is "so old mobile phone"
then you're using a typewriter to post this....

since a typewriter isn't a computer.
and a n8x0 isn't a mobile phone.

get edumacated

stefan0124 2014-06-25 12:16
Re: External battery pack for N8x0/770.
 
yeah,maybe N8X0 is not a mobile phone,but external battery pack is used for phones,For my phone, I use a solar power charger which gets me about 10-15hrs per charge, Universal USB Charger Kit, Emergency Cell Phone Charger (4-AAA gets about 30 mins) (I also have a few other travel, car/plane/plug/battery, chargers that I have not yet tried that might work out)

here are the links ,maybe you can get to know.

http://www.solio.com/charger/
http://www.234buy.com/

stefan0124 2014-06-25 12:23
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by endsormeans (Post 1430853)
If the n8x0 device line is "so old mobile phone"
then you're using a typewriter to post this....

since a typewriter isn't a computer.
and a n8x0 isn't a mobile phone.

get edumacated
so what`s n8x0.

endsormeans 2014-06-25 15:55
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by stefan0124 (Post 1430962)
yeah,maybe N8X0 is not a mobile phone,but external battery pack is used for phones,For my phone, I use a solar power charger which gets me about 10-15hrs per charge, Universal USB Charger Kit, Emergency Cell Phone Charger (4-AAA gets about 30 mins) (I also have a few other travel, car/plane/plug/battery, chargers that I have not yet tried that might work out)

here are the links ,maybe you can get to know.

http://www.solio.com/charger/
http://www.234buy.com/
I got a few solio's hehe....grand for mah N8x0's

you're preachin' to the choir man :D

endsormeans 2014-06-25 16:02
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by stefan0124 (Post 1430964)
so what`s n8x0.
N8x0 is either the N810 or N810 Wimax or N800 devices...all can run the same operating systems and utilize the same software...
NIT nokia internet tablet...precursors to the n900 and the new upcoming neo900 ....
Proper little hackable computers.... :D...you can have telephony...skype...gtalk...gvid talk....but it isn't a phone...no cdma, gsm or lte ....essentially.
Used to be a pretty penny.......alot of fun ...and now you can find 'em dirt cheap...good introduction to maemo...and a cheaper way for some to fiddle with multiple operating systems.

stefan0124 2014-06-27 11:51
Re: External battery pack for N8x0/770.
 
Quote:
Originally Posted by endsormeans (Post 1430985)
N8x0 is either the N810 or N810 Wimax or N800 devices...all can run the same operating systems and utilize the same software...
NIT nokia internet tablet...precursors to the n900 and the new upcoming neo900 ....
Proper little hackable computers.... :D...you can have telephony...skype...gtalk...gvid talk....but it isn't a phone...no cdma, gsm or lte ....essentially.
Used to be a pretty penny.......alot of fun ...and now you can find 'em dirt cheap...good introduction to maemo...and a cheaper way for some to fiddle with multiple operating systems.
o,,,,i see now,,but not very clear

endsormeans 2014-06-27 12:50
Re: External battery pack for N8x0/770.
 
Veeeryyy customizable for starters...
A good lil' hacking machine...right up to penetration testing tools.
The ability to run a good list of alternate operating systems and desktops...
Debian...(yup) , chroot easy debian (much easier:D), android for Nokia Internet Tablets (Nitdroid) dosbox, openbox, lxde, kde, E17 enlightenment , palm os (garnet), mac (basilisk), windows (95 and something else ...can't remem. ) mer, backtrack (I think...can't remem) ....Ubuntu Jaunty .....some run great some need more work, updating or fixing, some were done simply as proof of concept that it could be done I swear ..pretty cool all around...I'm sure I'm forgetting some
Clone your onboard os to your sd cards...back up your whole system and store it on your pc or wherever.lotsa cool stuff.

it has 2 sd card slots
great for multibooting multiple os's from your sd cards...
this is the storage cap I got a couple of mine to...

http://talk.maemo.org/showthread.php?t=90634

all around a pretty great device...I could go on ...but there are a ton of posts extolling it's virtues. the n810 has the physic backlit keyboard....built nice and slimmer....but has only one card slot for mini/ micro sd....good device....but I love the n800 for the beast it is and what it can do.


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