Using 4 rechargable Li-po AA batteries

[SidSilver]

That's not lithium-ion, it won't work with the powerboost.

[jeffy1021]

One could use 3 x NiMH AA batteries in series with a powerboost basic. The batteries would need to be removed from the GBZ and charged separately though.

[Blezio]

That's not lithium-ion, it won't work with the powerboost.

By powerboost you mean adafruit charger?
I won't be charging them in my GBZ. I think this option is useless when we talk about AA batteries. Raspberry works on this build.

One could use 3 x NiMH AA batteries in series with a powerboost basic. The batteries would need to be removed from the GBZ and charged separately though.

I use 4 of them and chinese voltage regulator AP5900
Here is the specification.
http://www.chipown.com/en/info.asp?id=3

[day]

Tell us where you find these 2500mAh AA

In a shop?

oh sorry, I misinterpreted, thought you were referring to 14500 types

hm interesting. Less risky to put in parallel than 14500s ?
why didn't we thought about that before...
why 3 ? why not 4 ?

[jeffy1021]

3x AA NiMH in series would be 3.6V which is the same voltage as lithium batteries. If you used the Powerboost Basic, one could take advantage of the low battery LED that turns on at 3.2V.

4x AA NiMH in series would be 4.8V. The spec for the powerbank IC that @Blezio linked has an input voltage of 4.25 - 6V so he would need to use 4 batteries.

In either case, the mAh is still around 2200.

[Villemus]

Could you do two pairs of series in parallel?

2x1.2=2.4@2300mah
+2x1.2=2.4@2300mah
--------------------------------
2.4V@4600mah total?

I don't have Excel with me to compare the total Watt-hours but would this give you the better yield?

[jeffy1021]

That would work assuming the boost circuit can supply the necessary current at that voltage.