e-Bike Lithium Ion Load Tester
Using power resistors is not feasable, but AC halogen bulbs are easily sources up to 500W , so multiple bulbs can be used to vary the current
| 120 | Vrms |
| 500 | bulb watts |
| 28.8 | bulb resistance |
| 52 | battery voltage |
| 93.88889 | watts |
| 1.805556 | amps |
So on a 52V battery pack a 500w halogen bulb would draw about 1.8Amps
Voltage can be monitored with a simple voltage divider to lower the 52V to something suitable ( < 3v probably )
Current can be monitored with a shunt
www.amazon.co.uk/J118mm-Tungsten-Halogen-floodlight-security/dp/B004HDVS20
This instructables guide would be a good starting point
www.instructables.com/id/Li-ion-Capacity-Tester-/
Could be better to stick with one technology AKA PyCom
docs.pycom.io/datasheets/oem/l04/
github.com/maddog75/LoPyI2CLCD