Tried using the EBD-USB+ meter to monitor the charging of the Boruit RJ-02:
(battery is some unknown, but working good 18650 — I had previously tested this battery to be around 2300-2400mAh and 40-50mOhms IR on the MC3000)
Boruit RJ-02 charges at a peak charging current of around 0.60A, and terminates at around 0.09A (this is measuring the USB)
(it’s a bit on the slow side, taking 4.5 hours to fully charge the ~2400mAh 18650 ; I forgot to measure the end voltage, but I recall the RJ-02 charges the 18650 pretty close to 4.20v +/- 0.02v)
Capacity from the EBD-USB+ meter seems to match the capacity of the battery when tested on the MC3000.