E7 on the GOTRAX scooters (G5, G6) means “Issue with the battery's voltage.” Most likely cause: a fault inside the battery or its management system (BMS). Try this first: switch off and restart.
GOTRAX lists E7 and E8 together and doesn't say whether the voltage is too high or too low.
The battery has its own management system that watches its cells, temperature and charging. This code means it found a problem. Never open the battery: contact support.
Step-by-step checklist
Work from the top. Steps go from free and easy to shop jobs. Switch the scooter off before touching any connector. Tick each step as you go. Your progress is saved on this device.
When it's time for a shop: if you've worked through every step and the problem is still there, contact the brand's support or an authorized service center. Bring your notes on when it happens, plus the code.