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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.
@Gordon
D23/24 are just IO pins...
Luckily the big metal battery clip is all 3v, so if you need to attach a wire because something got broken you could solder on to one of the two 'lugs' where it attaches.
With LiPo, as @Robin notes you'll need a diode to drop the voltage (since when fully charged, LiPos produce too much voltage). There's no place in particular that was made for adding one because of that.
However if you wanted to use an LR2032 rechargeable coin cell battery then there is space to add a diode on the PCB.
If you look at http://www.espruino.com/Puck.js#pinout you can see just above pin
D27there are 2 little solder pans. If you cut the PCB below them then it'll disconnect the 3v from the battery and you can solder a surface mount diode in there. ...but fitting a diode there is a pretty delicate soldering job so I'd only attempt that if you're feeling confident :)One other thing is if you want to mess with Espruino without coin cells there's always http://www.espruino.com/Pixl.js that you can run off micro USB, or http://www.espruino.com/MDBT42Q which does have space to solder a LiPo connector as it's got a voltage regulator on it.