If you're interested in DIY 1.5V lithium batteries using the XC6206 voltage regulator, this article is worth a read.
If you'd like to build a 1.5V battery yourself, follow along to create a squirrel-cage-style battery.
Appearance Comparison
The image below shows the battery without any decorative casing.
You can easily make it look better by wrapping a thin sheet of PVC around it.
Positive Terminal View
See the image below for the positive terminal.
Back of the Positive Terminal
Here's how the reverse side of the positive terminal looks.
You can directly solder the components onto the back side.
Feel free to make several of these batteries, but keep in mind that charging and discharging need to be handled externally.
Installed in a Clock
Here's what it looks like when placed inside a clock.
With a 2000mAh capacity and support for around 1000 charge cycles, the clock should run for a very long time.
The End