maemo.org - Talk - brainstorm: extending n900 battery life (mods)

maemo.org - Talk (https://talk.maemo.org/index.php)

- Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)

- - brainstorm: extending n900 battery life (mods) (https://talk.maemo.org/showthread.php?t=32167)

Re: brainstorm: extending n900 battery life (mods)

With the talk about mAh, what about the differing voltages? i.e. a NiMH battery is typically 1.2v, so 2100mAh isn't the same as a 5v USB battery extender rated 2100mAh.

Re: brainstorm: extending n900 battery life (mods)

I've had a look at the solar panels available after not having much luck in the UK with a fairly big twin solar panel charging 5x AA batteries... and the output of such panels maxes out at about 100mA in optimum conditions. Maybe good in LA or somewhere :)

Re: brainstorm: extending n900 battery life (mods)

Charging at a distance seems to have become practical, judging from newspaper articles I've seen. Easier charging is almost as good as having a longer battery life.

Re: brainstorm: extending n900 battery life (mods)

Quote:

(3200mAh/1350mAh)* 6 hours = 14 hours and 22 minutes in extreme using conditions
now for the talk time:
(3200mAh/1350mAh)* 9 hours = 21 hours and 20 minutes of continues talking

You need to compare energy. 3.2Ah * 1.2V versus 1.35Ah * 3.7V:

3.84Wh vs
4.995Wh

In reply to another poster, n900 is not likely to function on charger without battery. The charge circuit isn't able to regulate power that way.

Re: brainstorm: extending n900 battery life (mods)

Quote:

Originally Posted by mattiviljanen (Post 339362)

I second external battery packs. Lots of them available already, as previous links point!

I wouldn't use AA batteries, but rechargeable AA cells instead... Think of the environment! Put 4 or 5 of them (4.8V or 6.0V - someone prove me wrong, please!) together, add expensive, top-quality regulator, USB cable, some casing and you're done. First I laughed at chargeable chargers - out lout - but if they pack enough power, they just might save your week...

How about solar cells? Limited use cases, but hey, free power! Also widely available...

I mentioned AAA (AA is more bigger than AAA)
Check this: http://en.wikipedia.org/wiki/Battery...ttery_lifetime
Still, you are right about using battery cells.

By the way, I noticed that I didn't mention what I attended to in my previous post.
I was thinking of replacing Nokia original battery with 4 rechargeable AAA cells and connecting through a circuit where it also takes a power from a solar cells that is mounted on the battery cover (Or mounted in any better place?).

After all, I am sure people won't like to do this mod while their warranty remains unless someone made this in a good product and replaceable.

Re: brainstorm: extending n900 battery life (mods)

How about the cases with a battery built in like they make for the Iphone? As soon as the phone is put in the case the phone battery gets topped up.

Re: brainstorm: extending n900 battery life (mods)

@kamakazike: I think it'd be way too thick if they design it like the iphone's battery packs (the sleeve designs).

Re: brainstorm: extending n900 battery life (mods)

Nokia has a solution for this already (although not available with a USB pug yet)

http://www.mustaporssi.fi/files/midd...iddle_dc-8.jpg

Re: brainstorm: extending n900 battery life (mods)

according to nokia, the n900 sales package contains an adapter so you can use your old 2mm charger with n900 too. i imagine dc-8 has that?

Re: brainstorm: extending n900 battery life (mods)

how can u use the Nokia charger adaptor (CA-146C) i mean does it charge the battery when pluged ? and how can u charge that adaptor and how much power it contains ?
And is it true that when i get the device its better to charge it 12 hours before real usage ?
thanks