Page 1 of 1

Will battery pack work?

Posted: Fri Feb 15, 2013 4:17 pm
by TeaAddict
Hello, I'm starting a project that would require my Pi to be run off of batteries.

I was wondering if this Li-Po battery pack would word:

https://www.sparkfun.com/products/11359

It has 2000mAh capacity, and can supply the 700mA that the Pi Model B uses. But it has a 5.5V supply, while the Pi uses 5V.

Is this safe?

Re: Will battery pack work?

Posted: Fri Feb 15, 2013 4:30 pm
by rurwin
No. The RaspPi can take no more than 5.25V.

It may work; there may be enough voltage drop along the cable and through the fuse, but I wouldn't describe it as safe.

Re: Will battery pack work?

Posted: Fri Feb 15, 2013 4:36 pm
by TeaAddict
OK, thanks for the response.

How about connecting 8 rechargeable AA batteries (9.6V) through a 5V regulator?

OR, if I get the Model A which uses less current, I could use a 3.7V Li-Po battery through a Boost converter. They have both of those on Sparkfun.

Re: Will battery pack work?

Posted: Fri Feb 15, 2013 5:14 pm
by aTao
Try running your RPi from a known 5V issue shutdown command and measure the voltage at TP1, TP2. If your measured voltage is less than 4V75 you are probably good to go with a 5V5 battery pack.

One wee snagette might be that the overvolt protection diode starts to "do its thing" and cause the polyswitch to "do its thing" which can be/is a pain in the rear.