EPSON 4SLC2-50 Power Pack

This is just a little pass-time project that I finished a few weeks ago. It is a restoration project for the 4SLC2-50 Laptop sold in '93. I did the routine upgrades to the unit, 8mb ram, 500mb HDD (the largest it can take) and a 387SX FPU 16-25MHz Co-Processor. Those parts were found on Ebay and a reasonable price except for the ram upgrade, that had to be hunted down myself. The only thing I was missing is a battery, so I purchased some Li-ION batteries from:
https://www.18650batterystore.com/products/panasonic-ncr18650b-button-top
Simply soldered them together, I then 3D printed a simple enclosure that I designed in Blender.