can I put 3 individual USB chargers in series to charge the series battery pack?

[ErwinsCat]

I'm wondering if it is possible to use 3 of these battery chargers (3xTP4056) https://www.ebay.com.au/itm/402351347534?var=672349851255
 to charge a pack of batteries like a laptop battery pack.

[ledtester]

Your schematic is confusing or is wrong because a TP4056 module has separate inputs for the battery connection, power output and charging supply.

You can use TP4056 modules in series, but each TP4056 will need its own isolated power supply. This has been done before, e.g.:

https://www.eevblog.com/forum/projects/multi-cell-lithium-charger-from-a-single-5v-supply/msg1454259/#msg1454259

and here's a schematic of the idea:

https://electronics.stackexchange.com/a/274957/95488

[ErwinsCat]

Thank you for your reply, I did not realize modules have a common ground now I understand the issue with my idea. thanks again I'm happy I didn't tried my idea I think without a floating power supply, technically I would shorting 2 bottom batteries.