Hello,
I started in July with OlinuXino-Maxi; now I received a OlinuxIno-micro.
I see there is no more 3.7 V battery support.
On ebay, I find low cost (3$) converter:
http://cgi.ebay.fr/DC-DC-3V-to-5V-9V-Voltage-adjustable-step-up-Power-Transformer-Module-40-85--/251154128233?pt=BI_Circuit_Breakers_Transformers&hash=item3a79f3dd69
I suppose a fixed 5V (4.5 $) is more secure:
http://www.ebay.com/itm/DC-DC-Converter-Step-Up-Boost-Module-3V-5V-1A-USB-Charger-MP3-MP4-Phone-g-/110953876342?pt=LH_DefaultDomain_0&hash=item19d55dcb76
Am I right ?
Regards.
PO.
I've done it with a step-down from 2 cells. It works fine at 5.1-5.2v with no load. 5v with no load drops below 5v with load and resets the board, especially when you plug in a usb device.
Do you want to be able to charge the battery too? Might be worth it to take one of these apart:
http://www.aliexpress.com/item/Multi-function-mobile-Power-Dual-function-support-a-18650-battery-USB-output-of-mobile-power-freeshipping/593735979.html
AC and DC input to charger, 5v DC output.