knuthf, I'm curious what your source of your information is, regarding to how high the N900 will charge a battery? In the meantime, I trust dr-frost-dk's tests, with his own charging/discharging hardware that measures the current of the battery, more than I trust a what a random battery manufacturer puts on their battery's label, and experience from the testing in the thread linked to above, shows that when they suggest they have 2000+mA in the battery of that size, they're lying.

Read another thread here that describes the IC and charging software. There are even 2 patches that has not been modified for new batteries.

Dr-Frosk-dk use separate chargers and test the batteries with special hardware and software. When the N900 was released, the capacity for the rechargeble AA batteries were 1200mA. I recently bought rechargeable AA batteries with 2700mA. Read Dr-Frosk-dk properly, and not just what you want to read.

If you disregard the price, and willing to pay the 10A battery for the N900 is fully possible, so be very careful with claims,

hey random guy from the internetz, you dont even know that battery capacity is in mAh and not mA, so please dont teach us how battery charging is working
btw if i remember correctly, and i might be totaly wrong here, charging depends on the voltage so n900 will charge any 3.7v battery to the full capacity

and 2700mAh nimh AA batteries do exist for 3+ years

Would've responded in half the time, except I lost my post because the geniuses designing firefox (and all browsers, really) manage to come up with keyboard shortcuts for Back and Forward that are way too easy to accidentally hit while typing.

I was hoping you knew where that thread was, but that's fine, I'm sure I'll be able to find it once I have the time to search for it (assuming it exists, but I like to give people benefit of the doubt, and what you said is within realm of likely possibilities).

I know, and have no idea why you think that modifies what I said at all.

AA batteries? I am confused by you using this term, because at least among lay-persons, AA battery refers to those absurdly common cylindrical batteries. Is that what you're talking about? If so, then I have no idea what bearing it has to do on this. If you're talking about N900 batteries, then I have no idea why you called them "AA batteries". Is there some technical battery-specialist term I am unaware of here?

Hah, I would love to know what you think it was that I "wanted to read".

There's a pretty simple fact that is found in the first post, and requires no wanting, to find: most third party batteries inflated their numbers, and the ones claiming to be in the 2000+mAh levels, were often the ones with atrocious real capacity. Moral of the story: battery manufacturers often lie about their battery capacities.

That is the ONLY fact that is relevant to my claim that I don't consider it reasonable to trust a battery manufacturer until their battery has been tested. By all means, explain to my how anything else said in dr_frost_dk's work negates that general point (note, that if you understood my post, you'd know I didn't say that it was impossible for the battery in the original post to be 2450mAh or whatever, just that I would find that claim untrustworthy from an unknown battery manufacturer).

I'm not the one that has made any claims, really, aside from "battery manufacturers often lie about what their battery capacities are", which is pretty much a documented reality.

Nor did I say anything at all about the possibility of a "10A" battery for the N900 - so I'm not sure where you got that from. My initial post contained two things: A. I wanted to know where you got the 1280/1290mAh (you stated both numbers, not sure if typo, or what) charging cap number, and (completely unrelated) B. I don't recommend trusting the battery manufacturer to report the accurate maximum capacity.

[QUOTE=Mentalist Traceur;1277118][\QUOTE]

Search for "Charge" and press GO above.

I am talking about regular AA rechargeable batteries that can be charged by regular battery chargers. I used these e.g. in my camera, and the NIKON battery delivered 1200 mAh. I bought new now, that give 2700mAh which is better than Durecell batteries (you know, the ones that power the rabbitt).

Yes, I come apparently from nowhere, but know pretty much about this. You charge a battery by raising the current briefly above the voltage it is about to give, and the difference in voltage varies with battery technologies. A modern battery is like a capacitor, where the charge is held for later use. The capacity is determined by the chemistry and surface - increase the surface or replace the chemicals used between the conductors, and you increase/ decrease the capacity.

Ampere is the measure of current, Voltage the potential and h is 60 minutes. m is short for "milli", so there are 1000 mA in 1A.

If someone produce a battery that can be charged to 4000mA, it will use significantly longer time to charge, and it may need another voltage / current as you see for LiOn betteries. External chargers can work by simply measuring the heat in the battery, and just keep on charging until all the energy is used to heat the battery.

That is the ONLY fact that is relevant to my claim that I don't consider it reasonable to trust a battery manufacturer until their battery has been tested.

Just go ahead and believe what you want. The fact is that the IC that is fitted in the N900 to charge the battery is made for the 1240mA battery, it will stop here. If you buy a battery that claims to be able to be charged above this, you need an external charger. It may measure the heat in the battery, but I seriously doubt that because the battery software provide no indicator of temperature. So a bad battery that can only take 800mA, will get very hot at the end, and a battery that can take more will be charged to 1240mA and stop here.

I bought my battery on Ebay - see the posting earlier. It was expensive, cheaper ones are available, and some offer a separate charger. If you intend to get the battery charged more than 1200mA, you must use an external charger - like the referred Dane. What is said is that he tested numerous batteries and found only minor differences. But now you have new chemistry, cleaner production lines, larger surface, - e.g. use of tiny "holes" to hold electrones. To make these surfaces is very expensive, and pay more you get a larger surface with the "holes" that can be measured in molecules. But also this technology will become cheaper, mono-disperse particles less expensive and available to "regular" use makeing it available to all.

Start by reading:
http://wiki.maemo.org/N900_Hardware_Power_Consumption
.. and download the chipset specs and read this.
http://wiki.maemo.org/N900_Hardware_Charge_Meter discusses the battery and what you can see in the software delivered with the phone. Note the remark on Hardware: The wiki refer to alternate battery drivers. Please study the device descriptions on the site, and if you are here to win an argument, find yourself another site.

man seriously, what are you talking about, lithium cells are overcharged to around 4.2V and that is their full capacity
n900 or any other charger will charge battery of ANY capacity up to that charge, and that is that batteries FULL capacity, period!

well so if a 1000mah battery charger cant charge it to full,which will?but i saw some with 2000mah then the mugen power battery.dont know which to get now

n900 will charge any "3,7V" li-ion battery to its full capacity