hi , i have just bought a bluetooth speaker to use in the van. it comes with a mains charger but that would mean using my inverter which is a bit inefficient. i have a 12v lead for a pace minibox which fits directly in to the speaker and plugs into the ciggy lighter and i've tried it and it works but could i do any damage my new spaeker ? the mains charger output is 12v and 0.83 . cheers sean