4x Capacity Tester ZB2L3 Holder with Rocker Switch

thingiverse

I'm designing my 18650 test bench. It's an enclosure for the ZB2L3 module and micro rocker switch. Please, avoid making the same mistakes I did - don't purchase this module. This unit is subpar; it lacks an internal clock (no crystal), so time measurement isn't accurate. Instead, it relies on the internal clock of the uc, which in turn relies on the voltage from a cheap 3.3V regulator. For this precision margin of this unit, I'd estimate it to be around 20-30%. So, have fun testing. P.S.: I've mounted the dissipation resistor on a CPU heatsink. Best regards, Eliot