the USB protocol automatically limits the maximum power. So should not be a problem (if the charger adheres to the standards, which should be the case if it is not the most underground Temu product... So Apple should fit). I also use a 60 or 100 W USB-C charger and that's no problem
Thanks for the tip, I have just reported the error. According to my research, the Megaboom 4 all have two drivers and are therefore technically stereo-compatible. (Even if they are very close together in a Bluetooth speaker).
Logitech (ueboom) does not give the information, however ''subtel.ch'' pro in the sale of battery offers the change by a battery 3400mAh of 7.4 volt. I think that having this small text below with you to present just in case is a good idea:
533-000116,533-000138 Replacement battery for Ultimate Ears MegaBoom Bluetooth Speaker
Brand : CELLONIC® BT Speaker Replacement Battery
Capacity: 3400mAh interchangeable battery
Voltage: 7.4V
Cell type: Lithium Ion Battery / Li Ion Battery Pack
Replaced: 533-000116,533-000138 Original battery
Bon voyage ...