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heron61 is offline heron61
2008-11-11 , 08:31
Posts: 79 | Thanked: 4 times | Joined on Oct 2007
#51
Has anyone tried the Energizer Energi To Go Instant Cell Phone Charger with the n810? Does it work? How many extra hours does it give the n810? I'm going to be on a 11 hour flight in a month or so and my n810 is both my music player and ebook reader, and I'm looking for an inexpensive external battery to give me some extra time. How well does this one do?
 
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kenny is offline kenny
2008-11-11 , 18:52
Posts: 109 | Thanked: 26 times | Joined on Aug 2007 @ Caribbean
#52
Originally Posted by heron61 View Post
Has anyone tried the Energizer Energi To Go Instant Cell Phone Charger with the n810?
The Energizer device uses 2, AA batteries and costs $20.
Do a search on this forum for the Tekkeon MP1550. It uses 4 batteries and it's $15 at Newegg and eCost.
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heron61 is offline heron61
2008-11-11 , 20:55
Posts: 79 | Thanked: 4 times | Joined on Oct 2007
#53
Originally Posted by kenny View Post
The Energizer device uses 2, AA batteries and costs $20.
Do a search on this forum for the Tekkeon MP1550. It uses 4 batteries and it's $15 at Newegg and eCost.
I can get the Energizer device for $8.00 on ebay (from a reliable seller), so I'm undecided. Has anyone used the Energizer device on the n810?
Last edited by heron61; 2008-11-11 at 21:02.
 
bunanson is offline bunanson
2008-11-11 , 21:59
Posts: 4,030 | Thanked: 1,633 times | Joined on Jul 2007 @ nd usa
#54
Originally Posted by heron61 View Post
I can get the Energizer device for $8.00 on ebay (from a reliable seller), so I'm undecided. Has anyone used the Energizer device on the n810?
Any battery extender will somehow helped when the tablet battery is NOT flat. But when the battery is flat, 2 AAs or 2 AAAs are too small to be useful, http://www.internettablettalk.com/fo...ad.php?t=20117. I am looking for something like 8 AAs battery extender, have not been able to find any. Currently I am using this thing, which I got it for $32, http://www.amazon.com/Black-Decker-C...440712&sr=8-14. I have NOT been able to run it flat with my tablet :-). Unfortunately, I just checked, amazon.com has now put the price at 95$.

bun
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Karel Jansens is offline Karel Jansens
2008-11-11 , 22:10
Posts: 3,220 | Thanked: 326 times | Joined on Oct 2005 @ "Almost there!" (Monte Christo, Count of)
#55
Originally Posted by bunanson View Post
Any battery extender will somehow helped when the tablet battery is NOT flat. But when the battery is flat, 2 AAs or 2 AAAs are too small to be useful, http://www.internettablettalk.com/fo...ad.php?t=20117. I am looking for something like 8 AAs battery extender, have not been able to find any. Currently I am using this thing, which I got it for $32, http://www.amazon.com/Black-Decker-C...440712&sr=8-14. I have NOT been able to run it flat with my tablet :-). Unfortunately, I just checked, amazon.com has now put the price at 95$.

bun
I'm considering building one with 4 D-cells (4.5 Ah). It's really nothing more than a battery holder, a diode and a plug (charging is done with separate chargers), but I'm waiting for my Pandora to see what exactly it's charging specs are.

I have a 4 AA-cells extender (originally meant for the Archos PMA430) and it's capable to somewhat preserve the state of my 770's internal battery while it's running, but not to charge it fully, not even with regular alkalines. Still, it'll more than double the 770's battery life and on long flights, that's all one could ask for (danged crappy inflight movies -- grumble grumble).
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bunanson is offline bunanson
2008-11-11 , 23:11
Posts: 4,030 | Thanked: 1,633 times | Joined on Jul 2007 @ nd usa
#56
Originally Posted by Karel Jansens View Post
I'm considering building one with 4 D-cells (4.5 Ah). It's really nothing more than a battery holder, a diode and a plug (charging is done with separate chargers), but I'm waiting for my Pandora to see what exactly it's charging specs are....
I am luckier than you, I already have the tablets :-)

I also have a battery holder that holds 8 AAs. I did surgery on an instrument and now it looks like this. see attached pics.

I want like to know how to make this into a 8 cells AA battery extender. I guess, because of 8 X 1.5 = 12 V, I may have to have a step down, and a diode and a plug........I wish I know a little bit more

bun
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Karel Jansens is offline Karel Jansens
2008-11-11 , 23:34
Posts: 3,220 | Thanked: 326 times | Joined on Oct 2005 @ "Almost there!" (Monte Christo, Count of)
#57
Originally Posted by bunanson View Post
I am luckier than you, I already have the tablets :-)

I also have a battery holder that holds 8 AAs. I did surgery on an instrument and now it looks like this. see attached pics.

I want like to know how to make this into a 8 cells AA battery extender. I guess, because of 8 X 1.5 = 12 V, I may have to have a step down, and a diode and a plug........I wish I know a little bit more

bun
If you're connecting them in series, 8 AAs do indeed provide 12 volts. But how about you wire them up in two parallel blocks of 4 AAs? You could try a regulator (the 7805 seems appropriate) but that would

a) limit your output power to 1A (unless you use two 7805s in parallel) and

b) I'm pretty sure the 7805(s) would waste more power (heat) than my suggested solution of paralleling two blocks.

Plugs are easy; I've cannibalized mine from el cheapo phone battery extenders. They usually come with all kinds of adapters but the main adapter is pretty much always an "old style" Nokia 3 mm plug. Some careful dislodging leaves me with 4 to 5 usable Nokia plugs with a bit of wire for soldering. If you "shop around" you may even find one that has all female Nokia sockets, great for adapting battery-powered gizmos to AC/DC power adapters (my house is filled to the brim with throw-away LED gadgets that now happily waste power from the grid). The rest is the dabbling of the solder and the crimping of the socks.

Oh, you also need a 3mm to 2 mm Nokia adapter, of course.
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Watch out Nokia, Pandora's box has opened (sorta)...
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bunanson is offline bunanson
2008-11-11 , 23:47
Posts: 4,030 | Thanked: 1,633 times | Joined on Jul 2007 @ nd usa
#58
I am really sorry I wasted your time. I am no good in handy electronics unless with a step-to-step, buy parts here, put A into B etc diagram, I am going to take a pass. If you want my battery holder, the one show in the pic, you can have it free. I will mail it to you if you can make use of it. I have it sitting in the corner for the last 3 month.

bun
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vaiodon is offline vaiodon
2008-11-12 , 00:47
Posts: 40 | Thanked: 2 times | Joined on Jul 2007
#59
I bought a battery pack from Proporta, it's Li-ion and has 3400mAH capacity. Unfortunately, it arrived a day to late for me to take on my last trip abroad but it's kept my N800 running for about 8hrs while streaming Internet radio over WiFi. That's abt 5 or 6 times what I get with the internal battery.

I'd thought of building my own using AA NiMH cells but the Proporta part was better value & more likely not to cause hassle at some airport security check.
 
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Karel Jansens is offline Karel Jansens
2008-11-12 , 10:42
Posts: 3,220 | Thanked: 326 times | Joined on Oct 2005 @ "Almost there!" (Monte Christo, Count of)
#60
Originally Posted by bunanson View Post
I am really sorry I wasted your time. I am no good in handy electronics unless with a step-to-step, buy parts here, put A into B etc diagram, I am going to take a pass. If you want my battery holder, the one show in the pic, you can have it free. I will mail it to you if you can make use of it. I have it sitting in the corner for the last 3 month.

bun
I'm sorry about the misunderstanding. It seems it would not be trivial to change the pack you have from a 12 volt to a 6 volt one -- not without some serious tinkering, that is.

As for schematics, I'm usually flying by the seat of my pants myself; my knowledge of electronics is seriously limited. This I know: the "7805" I mentioned is a popular voltage regulator that puts out 5 volts, regardless of the input voltage (within certain limits). It is however "limited" to outputting 1 ampere of power, which I believe is less than what the Nokia tablets need when running and charging. You can improve the power output by hooking up several regulators in parallel, which multiplies that power output. However, regulators like the 7805 are not terribly efficient: they achieve the voltage step-down by essentially dumping it as waste heat and to go from 12 to 5 volts, you will need a heatsink on the regulators.

What you (and I!) need is a so-called "switching regulator", a piece of smart kit that steps down the voltage by switching the current on and off really really fast. These guys sell them: http://www.dimensionengineering.com/DE-SW050.htm

They even sell "breakout boards", which let you connect things without even soldering; and you don't need a capacitor as they built one in for you. Make sure you read the fact sheet though, and the tidbit on the page about parallel mounting.
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