What about connecting the two batteries together in parallel? Just make sure they'.e both fully charged when you do it - there shouldn't be a big problem sticking cells in parallel as it's basically just like having a bigger battery.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
What about connecting the two batteries together in parallel? Just make sure they'.e both fully charged when you do it - there shouldn't be a big problem sticking cells in parallel as it's basically just like having a bigger battery.