single cel 3.7 V 2600 mah with 19v charger how is this possible?
As brhans said, the 19 volt adaptor is not the charger, but the power supply. I do not claim to know why the heck they used a 19V supply to run a 3.7V charger, unless it is that it needs a smaller transformer. If you look inside the speaker you will find the actual charger, but it is probably integrated into the speaker's mainboard.