I want to use TP4056 in my solar power bank project to charge a lithium-ion battery (3.7 V, 2000mAh each one), but I don't know how to use it when I want to charge more than one battery.

Is those schematics correct?

parallel batteries

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series batteries

enter image description here

  • 1
    \$\begingroup\$ Please read the datasheet for TP4056, first line. You can’t use it for series connected batteries. \$\endgroup\$ – winny Sep 16 '18 at 20:35
  • \$\begingroup\$ I have found this and i think is true link of circuit ,but why i can't use just one power supply for the three tp4056? , I read that because they have a common ground ,I did not understand well, Can you explain more @winny \$\endgroup\$ – aymane Sep 17 '18 at 9:05
  • \$\begingroup\$ Do you have two floating power supplies for the two top batteries as per the schematic? \$\endgroup\$ – winny Sep 17 '18 at 9:37
  • \$\begingroup\$ In a project, i will use as power supply a phone charger and in another a solar cell. but why i need to use three power supply to charge the three series batteries. \$\endgroup\$ – aymane Sep 17 '18 at 14:27
  • \$\begingroup\$ Galvanic separation since the TP4056 isn’t isolated. Draw a circuit diagram with all your local grounds and you will see. \$\endgroup\$ – winny Sep 17 '18 at 14:43

The series circuit is not correct as it does not define each battery voltage. You would need a balancer circuit for serial charging these batteries.

  • \$\begingroup\$ Infact not ballanced voltage involves damage to the cells \$\endgroup\$ – Gianluca Conte Sep 17 '18 at 10:23

You should use TP4056 module for each battery(in your case you have to use 3 TP4056 module). Connect all the input power supply of TP4056 module in parallel and connect individual battery to each module.

  • \$\begingroup\$ He needs floating power supplies for the top two for that. \$\endgroup\$ – winny Sep 17 '18 at 14:42

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