Bose recommends a current rating of 1A (or 1000mA) or higher for optimal charging. If your charger's amperage is lower than this, it may cause the speaker to charge slowly or not at all.

Either way, I’d recommend bringing the charger with you. Ninety-nine bucks for a Bluetooth speaker isn't cheap, but Bose has done a really nice job with the SoundLink Micro. At the end of the ...