External Charger

that's the euro version (and US).

Here's a battery:

Singapur Battery (OEM)

That ships from singapur.

This one from china:
Hong Kong (OEM) Battery

and then this one from the UK (for more centralized shipping, but more expensive (A LOT, rather than 60 cents for the chinese "original" one, but it does look legit.)

UK (OEM) Battery

I'm probably going to order the charger & the battery from the UK. They're not that expensive for OEM. But for $hits and Giggles I'm going to order the 60 cent one and see if it's REALLY an OEM one with the correct hologram.

I'm sure many people use those in other countries, i've seen it on documentaries and such. Imagine buying a new phone, and having to charge it like that for 8 hours.... Call Martha Stewart, and tell her you've got your "Charging your phone while keeping in shape" video all planned out haha.

Have you guys seen 30 Rock? The episode where Tracy tries to sell a machine that replaces bread with 2 other slabs of meat? Well, in that episode they made a comical reference to Whoopy and said "Working Out with Whoopi" and Whoopi G was working out. It was hilarious.

http://www.youtube.com/watch?v=Ff9uYuh3XsQ

LINK

It's the other way around.
Bigger units have the space for smarter chips onboard the battery module, especially in laptop battery designs you need balancing chips to make sure no individual cells are getting out of sync with the others.

The NITs have no ICs in the batteries. There's mechanical thermal and overcurrent protection in the battery. (often missing or defective on third party batteries since it's a cost saving the consumer wont notice with their eyes until it all goes boom). The charging logic is in the tablet. There is a resistor in the battery for signaling the design capacity. The battery meter software uses that information for estimating remaining capacity and presenting battery low warning. It seems to ultimately make shutdown decision based on voltage though, not on calculated remaining capacity. The same applies when charging, it charges the battery to full (except if you use a "Special" charger, then it takes it up to slightly less than full and holds it there). Full is detected by charge current and battery voltage. It's essentially the only sensible way of charging Li-Ion (and Li-Polymer).

In the comments section of this article, someone claims that he tried this 1930 mAh battery and it worked fine for him.

But how do we know that's not just the seller of that battery posting the comment?

True, we don't know. I was hoping that someone here already tried it.

couldnt it be that nokia doesnt make their batteries more powerfull because of safety measurements? and companies like these have different guidelines for this that are not as tight ?

In a short while we will have batteries with nano tubes that can be recharged in only 2 minutes with a higher capacity and not losing power when not used. i read this

A new manufacturing method for lithium-ion batteries could lead to smaller, lighter batteries that can be charged in just seconds.

Batteries that discharge just as quickly would be useful for electric and hybrid cars, where a quick jolt of charge is needed for acceleration.

The approach only requires simple changes to the production process of a well-known material.

The new research is reported in the scientific journal Nature.

Because of the electronic punch that they pack, gram for gram, lithium-ion batteries are the most common rechargeable batteries found in consumer electronics, such as laptops.

However, they take a long time to charge; researchers have assumed until now that there was a speed limit on the lithium ions and electrons that pass through the batteries to form an electrochemical circuit.

Tiny holes

Gerbrand Ceder, at the Massachusetts Institute of Technology (MIT), US, and his colleagues used a computer simulation to model the movements of ions and electrons in a variant of the standard lithium material known as lithium iron phosphate.

The simulation indicated that ions were moving at great speed.

"If transport of the lithium ions was so fast, something else had to be the problem," Professor Ceder said.

That problem turned out to be the way ions passed through the material.

They pass through minuscule tunnels, whose entrances are present at the surface of the material.

However, the team discovered that to get into these channels, the ions had to be positioned directly in front of the tunnel entrances - if they were not, they could not get through.

The solution, Ceder discovered, was to engineer the material such that it has a so-called "beltway" that guides the ions towards the tunnel entrances.

Traffic management

A prototype battery made using the new technique could be charged in less than 20 seconds - in comparison to six minutes with an untreated sample of the material.

Most commercial batteries use a material made up of lithium and cobalt, but lithium iron phosphate does not suffer from overheating - something that has affected laptop and mp3 player batteries in a number of incidents.

Even though it is cheap, lithium iron phosphate has until now received little attention because lithium cobalt batteries can store slightly more charge for a given weight.

However, the researchers found that their new material does not lose its capacity to charge over time in the way that standard lithium ion batteries do.

That means that the excess material put into standard batteries to compensate for this loss over time is not necessary, leading to smaller, lighter batteries with phenomenal charging rates.

What is more, because there are relatively few changes to the standard manufacturing process, Professor Ceder believes the new battery material could make it to market within two to three years.
http://news.bbc.co.uk/1/hi/sci/tech/7938001.stm

Must be the seller!.....you must always look for the negative feedback of the seller on ebay....it doesn`t look good

It's been my experience that next quarter actually means next year, three years to market means closer to ten years, and within twenty years means never.

I dunno. He has a 99.6% percentage, which is not bad. The negative feedback is really terrible (as you said), but there are very much positive ones.
Perhaps I'll try this out somewhen.