Am 18.02.2014 um 15:21 schrieb Michael Mrozek:
Hi,
okay, I got the information about possible battery size increasements.
The current Pandora battery is 5.75mm * 45mm * 135mm and has 4000mAh (officially)
These sizes are possible:
6.2mm * 49mm * 135MM 5000mAh 7.2mm * 49mm * 135mm 6000mAh
I think I'll get a sample of the 6000mAH one.
4mm increase in width shouldn't be a problem (without having to increase the case). Right now, we're padding the battery compartment of the Pandora to make the battery fit, so the compartment is 1 - 2mm too wide already.
Ok, if we already have unused space in the battery bay it is no problem. Extending the bay a little could work - but it is already squeezed between the headset jack... Making it 4mm longer is certainly no problem since I already measure 137mm
And 1,2mm in thickness could also be brought down to 0,5mm in reality (plastic thickness, etc.)
Mainly it depends on how precise the battery is packed. The OpenPandora batteries appear to have some tolerances and therefore need a bigger compartment.
But I am not sure if there is 1.2mm excess room. And we might need that for the CPU...
This sounds like a good idea to me.
And even Pandora users might be able to use the battery, by filing down their battery compartment a bit.
So it's for Pyra or Pandora hackers.
Pandora batteries could still be used in the Pyra if we offer a simple frame to put the battery into.
What do you think?
We have to make sure one thing: the battery contacts must be at the right position.
But generally it looks better to me than expected. 6000mAh * 3.7 V = 22 Wh. That is half of my notebook. Wow.
BR, Nikolaus