...just think about the power... a neo pixel white full power draws about 60mA... so three hands with one color each full bright is 60+mA... since this is way over the expected draw of 20mA where the capacity is calculated for an average cell, it lasts for about 10..15 minutes, if at all, because the voltage drop with such a current may brown out puck and more so the neo pixel logic. Light power consumption got much better over its life cycle from incandescent to FL to LED, it is still behaves power hungry... Last but not least this was the reason early (red) LED watches where you had to press a button to show the time changed to LCD, and LCD is still better than e-ink / e-pager for displays that update 'constantly'.
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.
...just think about the power... a neo pixel white full power draws about 60mA... so three hands with one color each full bright is 60+mA... since this is way over the expected draw of 20mA where the capacity is calculated for an average cell, it lasts for about 10..15 minutes, if at all, because the voltage drop with such a current may brown out puck and more so the neo pixel logic. Light power consumption got much better over its life cycle from incandescent to FL to LED, it is still behaves power hungry... Last but not least this was the reason early (red) LED watches where you had to press a button to show the time changed to LCD, and LCD is still better than e-ink / e-pager for displays that update 'constantly'.