Sure does, damn LOL.It has internal battery
I have 2 mods that that have power curve. One I rarely use, the other I need to learn Escribe software. What I'll try when I get around to it, is a firm ramp up, top it out , then easy finish.
You probably knew about this. Firmware on anything that has firmware, should never be messed with unless it fixes a problem the device is having, or it brings a feature you can't live without. Wallpapers and such should be safe.
I don't know abut that one