Originally Posted by shadowjk

By "2mm system" I mean the whole combination of powersupply, battery and battery charger, and the relatively peculiar methods and charge algorithms used in all Nokia products with 2mm charge port. Nokia even published a pdf documenting parts of it. I wasn't talking about the connector or your connector as such..

Originally Posted by shadowjk

I was rather impressed by:

http://www.eastmaze.com/High-Capacit...1394.html?c=63

In a few test runs it's come out as 1310 - 1330 mAh using N900's own battery fuel gauge chip, and assuming RS=21 as determined experimentally by one of the kind sould in #meego.

Impressive that it's as good or better than original Nokia BL-5J, which iirc tested out as 1250-something with the same method.

Internal resistance "feels" like its lower, but that might just be a sign that there's no protection circuit in it...

The bq27200 fuel gauge doesn't use any method close to a "proper" one. It just integrates current discharged, until it reaches 3248mV (and the point at which this happens varies with system load, of course), and then assumes that the battery is at 6%, calibrates charge meter according that. The 0% is assumed to be at 3V.
Under normal operations N900 doesn't reach voltages this low.

My 2400mAh mugen showed up as 2400mAh with the same method when new, and now after some months of abuse it shows up as 2300mAh.

Originally Posted by zimon

I see you have a Mugen's back cover which came with a bigger capacity battery. How did you get that, or do you also have the Mugen 2400 mAh battery?

Did you just connect two BL-5J batteries parallel on their pins 1 and 2 (+ and -)? How did you manage to do that? Soldered cables tolerable to 1A to the battery contacts, or did you break the cover of the batteries to solder cables inside? More accurate photo of the connection of the two batteries in parallel would be nice.

Originally Posted by dr_frost_dk

And Jopod from DX

Originally Posted by wurtel

It's Japod, described as 1350mAh.

I ordered this: http://www.dealextreme.com/details.dx/sku.32398 4 months ago, and it works well. I even get the impression that it lasts longer than the original Nokia battery; certainly good value for money. I've been using it since I received it, and have not noticed any deterioration.

Japod appears to be one of the better battery brands. I would recommend it.

Originally Posted by dr_frost_dk

Yes i know it's good, but this thread is to sum all the battery's up for once and for all, so it's still going to be tested.
And if the next ebay battery's are no good than the double battery is going to be made of 2x Japod, i ordered 3, 2 for me and one for my friend

This thread is still a basic buyers guide.