Hi there folks! Just joined, first post! I had quick question and this seemed the best place for it. Im meeting up with someone tomorrow to sell my acoustic guitar and possibly purchase a small practice amp from him. Now the issue is i dont have a power source for the amp. I do have a chargeable battery pack that is used for jumping cars, has a usb port, air pressure pump, that whole deal. If i had a way to connect it to this would it give me the power i needed without damaging anything involved? I have the Stanley 500 amp car jumper thats attached! The amp in question is a acoustic b20.