Battery voltage, amp-hours and watt-hours
Battery labels commonly show volts (V) and amp-hours (Ah). Multiplying them gives an approximate energy capacity in watt-hours (Wh):
Example: a 48 V, 15 Ah battery is approximately 720 Wh (48 × 15).
Watt-hours are usually more useful for comparing the energy capacity of batteries with different voltages than amp-hours alone. This calculation does not tell you the battery's real usable energy, condition or system efficiency.
Why advertised range varies
- Rider and cargo weight
- Hills, surface and wind
- Temperature and battery condition
- Tyre pressure and tyre type
- Assist level, speed and throttle use
- Stops, starts and acceleration
- Motor and controller efficiency
For this reason, treat a manufacturer's range figure as an estimate under particular conditions—not a promise for every ride. A useful seller question is: “What test conditions were used for this range claim, and what range should I expect with my weight and route?”
Battery safety and replacement
Use the charger specified for the exact battery, follow the manufacturer's charging instructions, and do not use a battery that is swollen, damaged, unusually hot or otherwise showing signs of failure. Ask whether replacement batteries are available in your country and what the warranty covers.
Questions to ask before buying a SAMEBIKE
- What is the exact battery voltage, Ah and Wh?
- Is the battery removable, and can it be charged off the bike?
- What is the expected range for my route and assist level?
- Can the seller supply a replacement battery later?
- What are the battery warranty terms and shipping restrictions?
Continue with our full e-bike buying checklist or explore the SAMEBIKE model guide.