battery bank

  1. E

    how to properly make a charging circuit -- 2s 7.4V to 5V 2A

    I have 2 18650 li-ion cells, each at 3.7v (in case you don't see the pictures, they are available here : ) and this bay with this white connector I saw on youtube that depending on the length of the cell, we can know whether they have...
  2. R

    Advice on powering my diy guitar amplifier

    Hello, my name is matt. I have a few questions about supplying power to my audio amplifier projects. I have made 4 Bluetooth speakers and 1 small guitar amplifier so far. All of the Bluetooth speakers have been powered by a 5v battery power supply. Simple Bluetooth amplifier boards and a...