The simple solution to massive power at 5v is to use a PC's ATX power supply. There's plenty of info online, but you just short 2 pins out on the long white connector and it turns on, then you've got 5v at a million* amps.
Having said that, to test it you might as well try it out by connecting it to VBat+GND on Espruino. There's a thermal (self-resetting) fuse on the Espruino board which won't let you draw more than an Amp, so you're unlikely to blow anything up.
If you make sure you don't send values that are more than 63 to it you're unlikely to ever get to drawing more than 1 Amp.
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