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 ?
Not really. There are currently no lithium-ion or lithium-polymer technology available outside of labs that significantly increases power density. You should only expect normal variation, i.e. 10% or so. It's extremely unlikely that someone would be able to make a 1930mAh battery within the same volume as a 1320mAh battery. [We've been over this several times already btw.. ]
If you want more power you'll have to get one of those that come with a replacement back cover, i.e. a thicker battery (like those Mugens make).
Alternatively, a company could come up with an 'internal casing' which removes the space for the stylus and some dead space so you can fit a 1500mAh battery in their.
If you put the E71 and N900 battery side by side, you'll see it could definitely squeeze in the n900 if the deadspace was removed.
Most worringly is the fact it says its 1320mah on the label, AND in the software (lshal grep).... but inside it says 850mah!!!
most of it was stuck together with sticky foam / glue...
and you can also see what i mean about the hologram colours.
the shape of the face is slightly different....
i also made sure i used 2 genuine batteries from different countries... one came with the N900 itself, and the other from the link i provided earlier.. text does differ between the two genuine ones, so that cant be used to confirm a fake.
Here is youir answer on the 1930Mah superbattery... Absolute fake. You can order them in batches of hundreds from China via Alibaba. They have BL-5C, BL-6C, BL-4C, BP-6M, so on... Amazingly they are ALL 1930Mah and they are all Made in Japan but Manufactured in China. Hit the link below:
Since we are on the roll with fake battery capacities, I thought that I would mention Mugen's high capacity batteries of same size which belong in this thread as well.
Someone earlier mentioned that they had good experiences with them. In my case I purchased two 1800Mah Mugen batteries for my E72 as opposed to the OEM 1500Mah. Those were big time fakes as well. The performance was beyond obviously worse than the OEM.
I ordered THIS the other day and it came this morning.
Looking at Mr Bridger's pictures above, the battery is actually genuine. The charger is chinese and made by yiboyuan, but seems to be ok. I have put it on charge now and will report back once I know the usage of it.
Hit the link below: