Yes, you need to pull the PWR_BUT  on PMIC low when using the battery. You 
can do it by pressing the power switch also. In case of USB or AC input 
this is not needed. Hence the difference. 
Refer to TPS65217 battery section for more details.

On Thursday, April 4, 2013 5:45:47 PM UTC+5:30, Víctor MV wrote:
>
> Hi, 
>
> i'm trying to power my BeagleBone with a 3.7V LiPo battery. After going 
> through the docs and forums it was clear that it was doable however i'm 
> having difficulties powering it up using the battery. I initially thought 
> that connecting the battery to the expansion header P6 (BAT, BAT_SENSE and 
> DGND) and simulating the NTC with a 10k resistor (connected to BAT_TEMP) 
> will be enough but the Power LED D1 is not shining so there's clearly some 
> problem.
>
> Anybody could share his experience? Do i need to connect something else to 
> power the BeagleBone from the battery apart from the BAT, BAT_SENSE, DGND 
> and BAT_TEMP signals?
>
> Víctor.
>
>

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