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Here is the electronics, I took the picture after I cut the wires, the measurement being done before the wires being cut. A = out +- of XL6009, B = in +- of XL6009, C = out +- of TP4056

Here is the diagram enter image description here

Basically, the voltage keeps dropping on C, from supposedly 4V to only 1V when I connect it to XL6009 DC-DC converter, without connecting the fan. Based on few searching, I discovered this post TP4056 module shutdown problem , and found 2 solutions.

  1. Add more TP4056 and make them parallel (answer by Simon Dyer). They're dirt cheap anyway so I can afford few of them, but is it safe? And what's the diagram to connect them all properly?

  2. Directly hook the battery into in +- of XL6009 DC-DC converter, with switch (Answer by Antonio51). However, again, is it safe? I don't think the batteries have protection in case something happen with the XL6009 DC-DC converter.

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    \$\begingroup\$ You need to provide some more information, such as the datasheet tp4056.com/d/tp4056.pdf and a schematic or sketch of what you are measuring. \$\endgroup\$
    – PStechPaul
    Nov 26, 2022 at 5:22
  • \$\begingroup\$ Are you using XL6009 from HaoYu or XLsemi? XLSemi is the best. XL6009 180KHz 60V 5A Switching Current Boost DC/DC Converter Datasheet - HaoYu/ XLSemi (1) haoyuelectronics.com/Attachment/XL6009/… (2) xlsemi.net/datasheet/XL6019%20datasheet-English.pdf \$\endgroup\$
    – tlfong01
    Nov 26, 2022 at 6:45
  • \$\begingroup\$ Did you get your TP4056 from eBay or AliEx/Amazon? (1) aliexpress.com/w/…, TP4056 1A Standalone Linear Li-lon Battery Charger with Thermal (2) Regulation in SOP-8 - NanJing Top Power ASIC tp4056.com/d/tp4056.pdf \$\endgroup\$
    – tlfong01
    Nov 26, 2022 at 6:55
  • \$\begingroup\$ Why you use TP4056? XL6009 already has built in over voltage and over current protection. I think you can forget TP4056 and use a polyFuse for extra short circuit/over current. protection. \$\endgroup\$
    – tlfong01
    Nov 26, 2022 at 7:04
  • \$\begingroup\$ XL6009 4A is an overkill. I would suggest to instead use the popular cheapy LM2596 3A LM2596 module aliexpress.com/w/wholesale-lm2596-module.html \$\endgroup\$
    – tlfong01
    Nov 26, 2022 at 7:58

1 Answer 1

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Neither.

  1. You need a charger (CCCV = Constant Current, Constant Voltage), not a power supply (CV only). The XL6009 DC-DC converter is not current limited
  2. You MUST have a protector BMS (PCM) to protect each and every cells.

As you have it, your set-up is a house fire waiting top start. STOP NOW!

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    \$\begingroup\$ Thanks for the warning! I am aware of the fire risk, so I always keep the fire extinguisher nearby (imgur.com/a/66FCqm9), and also I am working semi outdoor (because the solder fume too). Anyway, I am still new to electronics, and this is some of my first "serious" project, so I still not having much knowledge about what charger that I need, how to connect them etc, so I just copying from the youtube about the wiring and the parts. In that mind, would you mind suggesting me which part should I get, and how to wire them properly? Thank you. \$\endgroup\$ Nov 26, 2022 at 14:53

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