Real-World Range Test: 44.7 km with a 15Ah External Battery

Overview

AF SCOOTERS carried out a real-world range test to verify a practical rule we have used for years when estimating scooter autonomy:

1 Ah ≈ 3 km of real-world range

To test this reference, we installed a custom switched external battery on a Segway Ninebot MAX G3 E and measured the distance achieved under documented riding conditions.

Objective

The purpose of this project was to verify whether a commercially rated 48V 15Ah external battery could deliver a real-world result close to our practical AF SCOOTERS range formula.

Hardware used

The tested battery was a 48V 15Ah switched external battery built by AF SCOOTERS.

Its configuration was:

• 13s3p
• 39 Samsung INR21700-48X cells
• commercial rating: 48V / 15Ah
• typical calculated capacity based on cell specification: 14.4 Ah

The scooter used in the test was a Segway Ninebot MAX G3 E.

Test conditions

The range test was carried out on 12 January 2026.

Conditions were:

• rider weight: 82 kg
• riding mode: Drive
• average speed: about 25 km/h
• temperature: around 10 °C
• strong wind
• around 90% of the route outside the city
• no recharging during the test

At the beginning of the test, the external battery showed 54.6 V and 100% charge.

During the first part of the ride, the scooter was powered only by the external battery. The original internal battery was not used during those first 44.7 km.

The test started in Valencia and the external battery reached its end of discharge near Chilches, Castellón, after 44.7 km. The distance was recorded by the scooter odometer and cross-checked against the route.

Result

The external battery powered the scooter for:

44.7 km of real-world range

Using the typical calculated capacity of 14.4 Ah, the test result becomes:

44.7 km ÷ 14.4 Ah = 3.10 km/Ah

Using the commercial 15Ah rating:

44.7 km ÷ 15 Ah = 2.98 km/Ah

Both values are very close to the AF SCOOTERS practical reference of:

1 Ah ≈ 3 km

What happened at the end of the test

During the last 2–3 km, the scooter showed a noticeable drop in performance as the battery approached the end of discharge.

The test ended when the battery was disconnected by the BMS low-voltage protection.

After that, the internal battery of the Ninebot was connected again and the trip continued until the total journey reached 76.2 km.

However, the result attributed to the tested external battery is only the first 44.7 km.

Why this matters

Many scooter battery listings show only the nominal Ah value, but users usually want to know something more practical:

How many real kilometers will this battery give me?

This project shows that, in this documented test, the AF SCOOTERS rule of approximately 3 km per 1 Ah matched the real-world result very closely.

Limitations

This project documents one battery, one scooter and one set of riding conditions.

It does not prove that every scooter will always achieve exactly 3 km per Ah.

Real range can change depending on:

• rider weight
• temperature
• wind
• riding speed
• terrain
• tire pressure
• battery condition
• scooter efficiency

So this should be understood as a practical estimation formula, not as a universal guarantee.

Original full research

The complete original study, including method, calculations, route, limitations and supporting visuals, is available here:

AF SCOOTERS original research:https://afscooters.com/blogs/noticias/bateria-15-ah-44-7-km-ninebot-max-g3-prueba-real

Iaroslav Tugai — Founder of AF SCOOTERS. Led the real-world range test, methodology and interpretation of the results.