I am looking to protect my circuit from a reverse polarity event. I found suggestions for using a MOSFET, particularly a p-channel type. Does anyone have a **specific recommendation for a device** to use for the LiFePO4 battery (about 3.2V nominal) technology? I am not totally sure about this, but would it be possible to select a MOSFET that has a Vgs that would also protect the battery from being over-drained?

Edit: Max current 500mA. Also looking to save electrons, so the device needs to be efficient both in on and off state.

Edit 2: Looking for a specific P-MOSFET or spec requirements to check in the data sheet when ordering parts to try out. Thanks.