Right now i am using coper top Duracells . . . i wonder if they make Lithium C batteries . . . their current drop off is very steep up is constant for a long time . . .
Next time i do it I will time myself. But i do the same area till its razor smooth.
I used the lady fare that came with it. It works as long as you dont let the teath touch you. For my less senstive areas i use a much bigger trimmer with built in vacume . . .
I tried to take the Seiko apart to see if i could get a look at the motor and see what its specs are before i purchase a AC adaptor to use with it. I did find a sony one at 1.5v and 700ma for 30$ . . . seems 1.5v Ac to Dc are hard to find.
I own a 1.5v but is 2A, and idk if that is constant or max output. Its used to charge my trimmer.
Making one would take longer than just getting a prefab one so . . .
I found having two batteries at hand works better. When you tap out the foil replace the battery with the other one then continue. Gives the batteries a chance to regen some i think.