.

Also, whats the difference between active and passive bass?

A Passive bass is a normal, run of the mill bass with a basic single tone control. The term active bass usually refers to the addition of a preamp, the same as the one in your amp and this preamp is powered by a battery.

Also, what is difference between active and passive pickups? Passive pickups use a magnetic source of energy and relatively large coils of wire to generate their signal. Active pickups use smaller coils of wire and have a preamp built into the pickup to boost the signal.

Also asked, does an active bass work without battery?

They will not work without a battery. A true active bass has active pickups that are powered by a battery that won't give an audible level of sound, if any at all.

Are active pickups louder than passive?

While an active pickup starts off with a low output signal, the preamp boosts it. Active pickups are usually louder than passive pickups for this reason. This boosting also compresses the signal, which means you end up with less dynamic range than a passive pickup.