The *!@?# battery in my bike does not have enough power to make the horn do more than squeek like a mouse. I've had the horn out to clean the points et al, and it's much louder with the 6V battery charger (low amp) than in the bike. The charging system works, so I'm figuring it's the dinky toy sized battery that just does not have the umph to do what's needed. It came with the bike and now it's time to replace it with something more substantial. My bike is 6 volts, nothing extra other than lights and horn(s). I'm thinking of twinning my horn to two horns. What should I look for ? Thanks in advance, Alyson