Sorry for those who may have read this - Accidentally posted this in general electronics.
Hi,
Alright so I have three 3.7V lipo batteries in series. Each 3.7V battery is attached to a TP4056 battery charger and then the outputs are put in series to produce the 11.1 V needed to power an amplifier that is there at the end. I wanted to be able to charge all three batteries at once so I took a micro usb wire, cut it, and stripped it so that I have USB on one end and the data and power wires on the other end. I taped up the data wires and then took the two power wires and split them and connected them to the input ports on the Battery Charger boards, thinking that the current would split with the voltage staying the same because of Kirchoff's Law. Now, weirdly the batteries seem to be charging after using a 2.4A power supply but now the Amplifier won't turn on, even when the power is not connected. What is the issue? With a quick unsolder of the USB cable split , everything seems to be working just fine.

 

We have a strong preference for schematics or block diagrams to describe circuits and the use of proper grammar to express thoughts.

You have three batteries connected in series, apparently each having it's own charging circuit. It's unclear if the chargers have a common ground, which would be bad, or if they're isolated.

 

Sorry about that. I made this diagram describing the issue. Please let me know if you need more information. Thank you so much!

 

If the charger output ground is isolated from the input ground, it could work.

If not, you're shorting the bottom two chargers and batteries.

 

If possible, could you explain how to isolate the grounds?

 

If possible, could you explain how to isolate the grounds?

Need a schematic for the battery chargers.

 

http://artofcircuits.com/wp-content/uploads/2016/06/TP4056_Protected_Battery_Charger-3.jpg

 

http://artofcircuits.com/wp-content/uploads/2016/06/TP4056_Protected_Battery_Charger-3-300x170.jpg

Can't be done; the output isn't isolated from input ground.

 

Sorry for those who may have read this - Accidentally posted this in general electronics.
Hi,
Alright so I have three 3.7V lipo batteries in series. Each 3.7V battery is attached to a TP4056 battery charger and then the outputs are put in series to produce the 11.1 V needed to power an amplifier that is there at the end. I wanted to be able to charge all three batteries at once so I took a micro usb wire, cut it, and stripped it so that I have USB on one end and the data and power wires on the other end. I taped up the data wires and then took the two power wires and split them and connected them to the input ports on the Battery Charger boards, thinking that the current would split with the voltage staying the same because of Kirchoff's Law. Now, weirdly the batteries seem to be charging after using a 2.4A power supply but now the Amplifier won't turn on, even when the power is not connected. What is the issue? With a quick unsolder of the USB cable split , everything seems to be working just fine.

You need a charge balancer module - or a good fire extinguisher in every room.