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2beers is offline 2beers
2010-10-19 , 01:33
Posts: 32 | Thanked: 2 times | Joined on Mar 2008
#11
Originally Posted by shadowjk View Post
design.capacity value is whatever the battery tells the N900 it is. In other words, the manufacturer of the battery can make it say whatever they want.
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.
 
shadowjk is offline shadowjk
2010-10-19 , 02:48
Posts: 1,258 | Thanked: 672 times | Joined on Mar 2009
#12
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...
 
2beers is offline 2beers
2010-10-27 , 17:54
Posts: 32 | Thanked: 2 times | Joined on Mar 2008
#13
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.
 
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dr_frost_dk is offline dr_frost_dk
2010-10-27 , 17:58
Posts: 1,503 | Thanked: 2,688 times | Joined on Oct 2010 @ Denmark
#14
Originally Posted by 2beers View Post
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.
i have already tested that battery.
1930mAh BL-5J Battery from e_cell (EBAY)
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