http://www.solware.co.uk/psp/psp-battery.shtml

I SWEAR that would just detonate the PSP battery. . ..

http://www.consolesandgadgets.co.uk/catalo...attery-6000-mAh

That's more like it!

7200 mAh

or stated another way... enough to power a 6000 all day, always on, with wifi running...

Socket Mobile Power Pack

Cheers,
Randall.

[qoute]
http://www.consolesandgadgets.co.uk/catalo...attery-6000-mAh

That's more like it!
[/qoute]

i have 2 best purchase i ever made

cool
do you use it with your PSP or with your Zaurus

URL above was/is broken... here's a working link... http://www.consolesandgadgets.co.uk/catalo...000-p-2229.html

That battery pack looks looks functional, except it lacks a lot of the feature of the Socket pack http://www.socketcom.com/product/AC4009-541.asp?View=Specs

The Socket pack will power the Z, PSP, cell phones, ipod, other handhelds (basically any device that requries 5V, or 6V dc). It comes with a bunch of different connectors to suit nearly any device. It also has a case with belt clip.

I use this with my Sl-5500:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...item=7520231420

Works great. 5 Amps, 4.8V, with a plug that fits the Zaurus. The battery comes with a belt clip (really a generic cell phone case), and a charger. The charger runs too hot for my comfort, but they also included a additional cable with bare wire ends, which I use with my better charger.

the first unit is actually an 1800 battery with a slot to add your psp battery.
so nope - won't explode :-)

I am using a custom battery pack that I made.
battery Specs: Lithium-ion, 1800mAh, 3.7v. charges off of usb plug.
here is a link to it some pictures of it: http://ntw1103.rightanglebuilders.com/cust...eryextender.htm

This looks very useful! Would you share the schematic diagram?

Thanks
daniel

I am using the Joytech PSP Power Extender. I got mine for around $14 by using Froogle. There is a picture up on Meanie's page. It is about 3 inches square by 1 inch thick.

I know this is more expensive, as most all things are that you can buy at a store that you can walk into.
Walmart shows the JoyTech Battery Pack for $19.92
It's under PSP accessories, and the website says it is in stock at most stores.
I'm going to pick up one tomorrow.

I will post the diagram as soon as I make one.

Brando have a good range of PSP power accessories:
http://videogame.brando.com.hk/prod_list.p...006&dept_id=006

This one looks particularly interesting:
http://videogame.brando.com.hk/prod_detail...=006&cat_id=006

I have found Brando to be very reliable and products are good quality.

Note that they are a customer of my employer, but I was using them before I ever even knew that!

Okay, here is the diagram for my battery.
This is my first diagram, so I hope it makes sense.

erm, that diagram looks scary, as if the resistor is in the wrong place to limit charging of the battery.
as a rough guess, the attached is what I think it should look like. usb charges battery pack through resistor, and can power Z at same time. battery pack powers Z bypassing resistor using diode

Click to view attachment

charging resistor chosen so if batteries are really flat, i.e. half voltage (2.5V) then charging current is 125mA. Could probably happily use a 15 ohm res to speed charging, but have to be careful to not overload USB port if also powering Z, nor to cook the batteries.

Ntw's circuit is pretty scary.

The only component in the circuit that's doing anything is the diode (the resistor only protects the LED), which drops the charging voltage to approximately 4.4V.

LiIon cells explode when charged beyond 4.3V.

And that's assuming it's plugged into a properly regulated USB port giving 5V. A cheap AC-to-USB charging adapter might be putting out more than that.

I'd build a simple charger from a LiIon charger IC (say Maxim's nifty looking MAX1555, I really must order some samples) which would be almost as simple as Ntw's circuit, safer, and you get a "battery full" indicator into the bargain!

i am assuming nicads here, if so then the charging circuit makes sense, not the best or the most efficent but its ugly and it works.

things to watch out for: the 0.6v drop across the diodes (in this case the drop should be closer to 0.6 rather than 0.7) not the best way to do it but its very robust. now for 0.6V*0.5A we get 0.3W so you could use a small signal diode instead, saves alot of room

i would actually look into a 2 cell charger with a buck boost converter. hackaday had one. you put 2 cells in series giving you about 3v and use the boost to pump it up to 5v at high efficcy. you would be looking at about 80% efficency at such small voltages where as your design relies on resistive parts giving it a good iffence on discharge (only loss is via the diode) but really bad on the charge (lot of power wastage in the diode)

other thing to watch out for is reling on the nicads to give 1.25V, this is a VERY BAD IDEA, at full charge they can give more than that for about 5 mins, meaning a dead Z if you are unlucky. also as the battries discharge once you hit 80% capacity the voltage falls rapidly, meaning you could lose up to 20% of the total battery capacity

if you have a pic programmer then you can get really good high effincy battery charger/discharger plans off of the net. if you dont then there are others that reliy on discreete ICs that have better effincy but less features. the advantage is they all fit in an altoids tin

hi here
i've just found and bought the Etitech Nano mobile charger :
http://etitech.com.my/products.php?sm=prd1
it is only 2100mA, but it is slim, chargeable via usb and at least it seems to charge the zaurus!
i'll let you know more later

I'm looking at building a battery extender for my Z, and I think I have most of the materials, but am lacking in the knowledge department.

I've got 2 900mAh, 3.7v iPAQ batteries to use, but need to know how to wire them up. Could somebody sketch up a diagram? I'm looking to have a power input jack (probably from a Z's adapter), a power output jack, and the batteries.

EDIT: The batteries are Lithium-Ion

if they're lithium ion, and you don't have the original charging circuit, I would strongly recommend you don't try it... it's too easy to overcharge and damage them or make them go bang!

http://www.google.co.uk/search?q=lithium+ion+explosion

What do you mean by original charging circuit? I have the adapter/cradle to charge them, but that's probably not what you mean.

EDIT: OK, what if I charge the batteries externally? Can somebody draw up a pattern then? (2 batteries, power output, and resistor)

you have to have an intelligent charging circuit for LiIon, as there are two phases to charge it up. if you do have an external charger for it.

It's really a bad idea to do this yourself, unless you've got some electronics experience. You definitely can't do it without a few IC's designed for the task.

You could actually get away with charging a single cell or a parallel array of cells with just a big current limiting resistor, but it's still a really bad idea. You definitely can't do it to a series array, which is what you're considering to get the 5v the Z needs. If you were to use a parallel array, it would need a step-up converter to get from ~3v to 5v, and that's at least another IC and an annoying-to-procure inductor, with layout and filtering rules that make my brain hurt.

Sadly, the resistor is how the 9800mah packs are wired - mine broke and I needed to open it up to effect repairs. I'll probably replace the charging circuit with a dedicated IC in mine at some point (but retain the stepup converter, because of the aforementioned brain hurt.)

Purchased this one today:

http://www.portablepowersupplies.co.uk/usb...batterypack.htm

feedback to come

I'd really like a battery extender with a built-in usb hub, a memory card reader. oh, and a 1.8" hard drive. Oh yes,, and a GPS and a 3G modem or bluetooth adaptor

(edited to add GPS)

Well the battery is light but strong, tried with blackberry, V3x and later Zaurus worked perfectly on both and nothing burned down, all charged and battery still has food next step is trying with my USB powered HUB... same connector... who knows

I've had a Zap Universal Power supply (blew up with a flash and bang) and a 9800mAh PSP battery - never seemed to hold its charge for too long - currently unable to recharge........
I am still searching for a viable battery source for the Z - preferably just as speculatrix describes +GPS :-)
Seriously though let us know how this thing works out....

i've bought quite the same product ! the Nano mobile charger from Etitech :
http://www.etitech.com.my/products.php

it works quite good, with my PSP, my nokia6630 and my Zaurus; although it works best when charging while the device is switched off... mine is only 2100 mAh whereas the portablepowersupplies' one is 3400 mAh so it should be stronger. this is definitely the kind of charging device i was looking for

Something like this:

http://www.sparkfun.com/commerce/product_i...roducts_id=8610

would be neat (6000 mAh! 3.7v, that's what the Z is, no (for internal battery)?).

I realize it's used, but for $10... I just thought that somebody may find it useful.

I am looking for a battery extender that I can plug into my 3100. The one laan posted is almost perfect but I want one that takes (rechargeable) AA batteries so I can always replace them when they stop charging. Anyone know of such a device? Maybe it would be easy to just build my own. 8 rechargeable AA batteries (4 in parallel to 4 more should be 4.8v i think) in a pack plugged into the Z. Any ideas?

Maybe something like this would work? http://www.bixnet.com/usbbaboxc4aa.html

I've been using a Sanyo Eneloop KBC-L2 for some time now. Charge by USB or AC adaptor and has 2xUSB output. It's rated at 5000 mAh, with a full charge I can recharge my 750 more than 3 times. I take it on any long journeys and use it to recharge my MP3 player too. I think it's an excellent product.

Take a look at the KBC-E1S on the same page, I think it may be what you are looking for.

Thanks for the recommendations. I didn't know Sanyo made some of these things. I love their batteries. I don't think a two AA battery one will have enough juice though. I see a lot of 2 battery boosters out there, I wounder why.

I ended up buying the following one:
http://www.amazon.com/gp/product/B0014KLX9C/ref=oss_product
I will post a followup when I get it and have tested it. Hopefully it will be enough.

Well, got it. It works but gets really hot. It ended up melting so I had to order a replacement. The replacement still gets hot but hasn't melted yet. It gets really hot when charging the zaurus or my sony ericsson phone so it's not the zaurus' fault. I think it is to do with fresh batteries. After the batteries go down a little it doesn't get hot anymore. But for the short first 10 or 15 minutes I use it with freshly charged batteries it gets really hot. Do voltage regulators get hot when limiting voltage?

Two main reasons I got it work though.
-charge the zaurus while it is off
-be able to swap zaurus batteries without having to powerdown the zaurus (avoid very long bootup time). Still have to turn zaurus off though or sometimes it does die as there is not enough juice from this pack to power zaurus/lcd/wifi card all at the same time.

It is also supposed to charge the batteries as well but I have not been able to get it to do that. So far it just blinks the light which means the batteries are not rechargeable. I'll try when they are completely dead.

This item looked promising, but with it melting I will always have to be watching it. I wish there were other things out there that worked well for this purpose.

Yes voltage regulators do get hot, see http://en.wikipedia.org/wiki/Voltage_regul...age_stabilizers - the metal bit in the picture is for attaching a heat sink.

But it sounds to me like the design is not good if the case gets so hot that it melts. Only using it with used batteries doesn't sound like a good solution to me. Batteries can get hot when they run down but not usually when they are fresh. My Sanyo unit doesn't get hot when I use it.