For heavens sake that's the Vds = -10V graph, irrelevant to switching.
For pities sake that's the Vds = -10V graph, completely irrelevant.
I'm planning to use a Microchip LP0701 to switch power from an 18650 to a Wemos D1 Mini. It comes in a TO-92, but it has a couple ohms RDS(on). I'm just not sure how well it will handle the high-current WiFi activity, but will be testing it when the Minis arrive.
I decided to hedge my bets a little on this, I have done a PCB that has the option of using either a SI4459ADY or a IRLML6401 based power switch. The SI4459ADY is the easier to solder option, I have some coming from the far East at 13p each, we shall see how good they are.
The SI4459ADY has a bit higher gate threshhold than I'd like, particularly for supply voltages down to about 3.5V.