Charger/discharger build

Swear you guys must be getting sick of me by now
I figured this would be the best place to post this up, mods please move if I'm wrong.

I know everyone is probably using the opus or other systems to test their cells but i'm trying to cut right back down for my uni project, and save the money to buy more cells.
When i started this with a total of 4 cells i made a very small tester using a TP4056 module, a usb port from an old PCB, couple of earth magnets from hard drives,a keweisi capacity tester module and a usb current load. These worked great but i could only really do one cell an evening. I think that although the TP4056 modules claim they can charge at one amp this might not be correct. The discharge side of things works great, one amp setting and away it goes.

So my plans for a larger unit are as follows.

Separate the charging and discharging process. A bank of say 10 TP4056 modules for charging 10 cells at once, this time in ebay special battery holders built on a large aluminium plate to deal with the heat problems. Then using my current system of the USB based adaptor for discharging, with the option of adding more discharging modules with time and funding.

Has anyone used this sort of system before?

Mr Constentin built a charger/discharger that looks really neat. I'm still missing some components to make my version of his design. Check it out and it might help you get some ideas.

I think the TP4056 has the capability of charging at 1Amp. If the resistor is set correctly, then it will charge 1Amp to start with. Now, this does not mean that it charges at 1Amp during the whole charge cycle. It does taper the current as it goes into CV mode and as it gets to end of charge. The resistor is just a reference so the chip knows what the max is.
If the manufacturer of the TP pcb didn't use the proper resistor, then yes, it will not charge at the max current.
In my build, I plan on replacing all the reference resistors with digi-resistors so I can set the charge current my self.

The TP4056 will charge at 1 amp but if you connect 4 cells to it then each cell will only get 0.25 amps.