Thanks for your quick responses.
The battery I'm using is a 72V, 20 AH from Amazon: https://www.amazon.com/dp/B0979383J3?psc=1&ref=ppx_yo2ov_dt_b_product_details
currently it reads 77.5 V. I couldn't find any visible fuses in the circuit, so I'm not sure if I have any at the moment.
I've...