Here's an open-source 3D reproduction of the Macintosh Portable battery (M5137) available to download on Thingiverse. Big thanks to @alxlab for loaning his battery to me for 3D modeling!
Doodling around with NewtPaint on the MessagePad 130 for Adventures of McFloppy comics. I'm guessing the B&W aesthetic is more ideal than the color version? I'm going to have to animate this little dude at some point, somehow.