Have a nice time! May I ask you a question? Everywhere they write and talk about 6 and 12 hours of battery life. Is it when all three channels of the amplifier work simultaneously: microphone plus guitar plus backing track or just one? For example, backing tracks with a bass guitar and drums require more energy than one connected guitar with a microphone, and even more than just one guitar. What should I pay attention to when using all three elements at the same time? On the volume indicators so that they don't reach the limiter peaks?