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

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

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.

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

@tlfong01 I don't know, the local seller didn't specify where they bought it and what kind of brand it belongs.

@tlfong01 and for the module, then how can I charge the battery with? I use TP4056 for charging. And the LM2596, I'll look into it.

@PStechPaul here the diagram imgur.com/a/EtQtYi1

Ah, there seems some misunderstanding somewhere. PStechPaul's diagram is good to clarify things. Let me look at the whole picture and give you a quick reply, perhaps during weekend.

Alright, don't worry, I also still waiting for the replacement XL6009 to arrived, in case if mine is defective, or the marking actually flipped. If you need any more information, just chat me here, or if you have a discord, chat me there McTee261#6133