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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
I don't have any specific links to batteries on eBay, but you could actually just solder a PHR-2 connector onto a phone battery. I've done this a lot and it works very well.
I don't think the Parallel Charging board will work (but I could be wrong) - I think it requires at least two cells (on a 3 pin connector) rather than one.
I actually soldered up my own adaptor to charge the batteries from the B6 - just a Male PHR-2 connector and two leads...