# Which BATTERY for Raspberry PI B+ and 2 X Unicorn Hat 8x8?

**URL:** <https://forums.pimoroni.com/t/which-battery-for-raspberry-pi-b-and-2-x-unicorn-hat-8x8/306>\
**Category:** Support\
**Created:** [January 25, 2015, 11:47am UTC](https://forums.pimoroni.com/t/which-battery-for-raspberry-pi-b-and-2-x-unicorn-hat-8x8/306 "2015-01-25T11:47:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![brunojunior](https://avatars.discourse-cdn.com/v4/letter/b/9f8e36/32.png) [@brunojunior](https://forums.pimoroni.com/u/brunojunior)\
**Post date:** [January 25, 2015, 11:47am UTC](https://forums.pimoroni.com/t/which-battery-for-raspberry-pi-b-and-2-x-unicorn-hat-8x8/306/1 "2015-01-25T11:47:50Z")

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For my University project I will need to be mobile.

So would a 9V battery be enough for the Pi B+ and 2 Unicorn Hat 8x8?

Much appreciated any reply.

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**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\
**Post date:** [January 25, 2015, 4:23pm UTC](https://forums.pimoroni.com/t/which-battery-for-raspberry-pi-b-and-2-x-unicorn-hat-8x8/306/2 "2015-01-25T16:23:17Z")

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The safest and easiest way to power a Raspberry Pi is to use a portable mobile-phone power pack- one that comes with one or two USB ports and supplies a stable 5v.

Look for ones that have a ~2Amp output ( for charging tablets on the go ), which should be sufficient for a Pi and possibly just enough for two Unicorn Hats at their default brightness.

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**Author:** ![Alistair12](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alistair12/32/121_2.png) [@Alistair12](https://forums.pimoroni.com/u/Alistair12)\
**Post date:** [January 25, 2015, 6:40pm UTC](https://forums.pimoroni.com/t/which-battery-for-raspberry-pi-b-and-2-x-unicorn-hat-8x8/306/3 "2015-01-25T18:40:09Z")

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I have used a portable power bank battery 2200mAh which I had a B+ running a scrolling message on the unicorn hat for about 1/2 an hour (still had power left), it even had a wi-fi dongle as well (more power used), to allow me to connect to the pi and send the display commands. Battery comes in a nice little bag with a lead and several connector types including the micro USB for the pi. On the B+ the power light flashes or does not come on if there is not enough power, you can vary the power consumption by lowering the brightness.