12v Li-ion battery beocreate 4ch amp

Hi, I'm planning on powering my beocreate 4ch amplifier with a 12V li-ion battery consisting of 24 18650 batteries wired into 3 cells and I have two concerns. 

I wonder how low the voltage of the battery can drop before it can't power the amplifier anymore. I read that the amp can take a minumum of 12V and the battery pack has a voltage of 12.6 - 9 Volts, so I'm wondering if you would recommend me to wire the batteries into 4 cells instead, resulting in a higher voltage. 

I also wonder if you know any good way to charge the batteries. I want to be able to leave the batteries and the chargers inside the speaker while charging. 

Best regards Hannes



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