I have one of these - PRT-10967 3.3V Step-Up Breakout
https://www.sparkfun.com/products/retired/10967
I had difficulty finding it on your website because it was discontinued.
My idea was to use it to get a longer lifespan out of a battery.
Do you have any suggestions on how to do this?
Once a battery is [dead, it’s pretty much all use up. You might be able to squeeze a few mAh out with that board, but it’s not going to last much longer. You either need a bigger battery or a smaller load (or both) if you want longer battery lifespan.](https://youtu.be/0xD9qEdHFIE?t=25)
You can find it at https://www.sparkfun.com/products/retired/10967
/mike