Need a new battery
 

Well the time has come for me to purchase a new battery for my n900 and was wondering iv there are any genuine higher capacity batteries out there without needing new rear cover.

Have seen some 1930mAh batteries but surly these can not give out that amperage, Hase anyone tried these ?

Chris

http://cgi.ebay.co.uk/1930mAh-BL-5J-...item2ead0c09a2

Re: Need a new battery
 

There was another thread where someone opened up one of those 1930mAh batteries and found a 1200mAh cell inside.

The only genuinely higher capacity battery is the 2400mAh Mugen Power Battery, which is also physically bigger and makes your N900 thicker.

Re: Need a new battery
 

So just stick with the standard nokia battery would be advised then ?

Re: Need a new battery
 

I just ordered that Battery - paying with paypal.
If the battery has way less than 1930mAh i will return it.

I ordered some "original" Nokia Batt. from Honkong - the cheaper one realy has almost 1300mAh, the slightly more expensive has 880mAh.

I use the "Desktop Command Execution Widget" to see the Battery capacity in mAh.
I don't know if it's really reliable - so far it seems, as if it was giving an appropriate value.

Re: Need a new battery
 

well when are you expextng the batter as i may just hold on to see you outcome with that purchase

Re: Need a new battery
 

Ok, report then what you did get. Because it is the same size as the original battery, I highly doubt you won't get any more than the original BL-5J 1320 mAh +/- some 10%.

There is no empty space in the original BL-5J battery, it fills the N900 battery slot completely. So only way to get more capacity in that same space would be to use some other type of chemistry than Lithium-Ion. And then it becomes a question could N900's charger suipport this new type of battery.

If you really need bigger battery, Mugen 2400mAh battery with bigger back cover is the only proven solution.

Re: Need a new battery
 

[QUOTE=2beers;838355
I use the "Desktop Command Execution Widget" to see the Battery capacity in mAh.
I don't know if it's really reliable - so far it seems, as if it was giving an appropriate value.[/QUOTE]

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.

Re: Need a new battery
 

saw and ordered that :
http://www.eastmaze.com/High-Capacit...one-p1394.html

Re: Need a new battery
 

Any update on these ordered batteries, as need to purchase a new one asap and not sure if i should just order the nokia origanal battey ?

Re: Need a new battery
 

I can vote for a 'normal' capacity Japod battery, here : http://www.dealextreme.com/details.dx/sku.32398. Lasts more or less the same time, reports a tiny bit less mAh than the Nokia original one and is a bargain for $8.84, incl. shipping.

Easy to carry a spare one around, as I normally do when going out or expecting to be long time away from a power socket.

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)