Divoom - VOOMBOX OUTDOOR v2 - 15W bluetooth speaker - NFC - Rechargeable with 12 hours of battery life, integrated handsfree (Electronics)
Although somewhat imposing and somewhat heavy (Yes it's solid, so obviously). A pleasing power well above my expectations and its very far from bad. NFC is a little more autonomy and is frankly not troubled, even at full power. In short, a small bomb