State of charge

State of Charge (SoC) - the percentage of battery remaining. 100% is full, 0% is empty. Except it’s not that simple on an EUC.

Why the number lies

SoC on most EUCs is estimated from voltage. But voltage drops under load (voltage sag) and recovers when load is removed. So your wheel might show 40% while cruising, drop to 25% when you accelerate hard uphill, then bounce back to 35% when you stop. The battery didn’t change - the measurement method did.

Why it matters for safety

If you use SoC to judge your safety margin, understand that the number is optimistic under load. The real remaining capacity is lower than what the display shows during hard riding.

555 take

Treat SoC as an estimate, not a fact. Below 40%, start riding conservatively. Below 20%, ride like you’re on borrowed time - because you are. The range guide explains why battery percentage is only one input in route planning.