Re: Need a new battery
 

Just got the batteries.
Both show different values:
one says 1241 mAh
the other one 1244 mAh

So i REALY doubt the battery tells the value. If this value is somehow stored in a chip i would expect it to be
1st - exact the same in every battery
2nd - at least somewhat close to the value they say it has.

Anyway - the battery powers the n900 for aprox. 120mins with a radio stream turned on. (screen off!)
I'll try with the original Battery the next days. If i remember right, this is pretty much the same time.

So the battery has probably the same power the original has - and therefore is FAR from the 1930mAh the seller (e_cell) claims it has!

I'll write again in some days when i have some comparison to the original.

Re: Need a new battery
 

it's not stored digitally in a chip, it's stored in analog form in a resistor. the phone measures the resistance on oot and translates the resistance into a capacity value. Because it's analog, it will vary a bit each time it gets measured.

this effect is seen with first batch mugen 2400mAh. They have a thermistor instead of a resistor. A thermistor has resistance like a resistor, but the resistance varies with temperature. Thus, the reported design capacity with the mugen 2400 varies wildly depending on the battery temperature at boot. (omething like 17-20C gets close to 1300mAh.. Booting a body temperature mugen shows 500ish mAh design capacity...

Re: Need a new battery
 

Right - update as promised:

The "1900" mAh Battery sold by e-cell via ebay has LESS than the original 1320 mAh from Nokia.
In othe words - it's fraud.

------------------------ details -----------------------
1st
the batteries itself claim to have ~1240mAh - so even the producer of the battery didn't store a value even remotly close to the one claimed by the seller!

2nd
I tested the battery by turning on 3g & streaming a Radio station. Lasts for approx 120mins.
Compared to the 1/2 year old original: Lasts for approx. 150+mins
The test was done in the same location (same connection) with the same Radio station (presumabley the same bits/s)

So if you buy - don't buy this battery. It's not worth the money.

Re: Need a new battery
 

i have already tested that battery.
1930mAh BL-5J Battery from e_cell (EBAY)