I'm developing a project and I need to connect to my Arduino Mini with a SD card breakout board. The problem is that I can't plug it directly to the Arduino since it is already powering some sensors and a BITalino, and I was told that it would, for some reason, be better to connect an external battery to the SD board.

My question is if i can supply this [MICROSD CARD BREAKOUT BOARD+](https://www.adafruit.com/product/254) with a 3.7V battery, instead of a 5V.

Thank you!

Description:

* Onboard 5V->3V regulator provides 150mA for power-hungry cards
* 3V level shifting means you can use this with ease on either 3V or 5V systems