How many kilometers can a 72V 20Ah lithium battery run?

[David]

About fifty to sixty kilometers. For a 72V 20Ah battery, a 1000W motor consumes power too quickly, which means it can run fast but not far. Of course, this is under full-speed conditions. If the throttle is only slightly turned to maintain a speed of 20-30 km/h and moves at a constant speed, it can still run quite far, with seventy to eighty kilometers being quite normal. Additional content: Lithium battery maintenance methods: 1. Do not replace the charger arbitrarily: Do not change the charger at will or remove the speed limiter on the controller. 2. Protect the charger: To reduce costs, most current chargers are not designed for high shock resistance. Generally, chargers should not be placed in the trunk or on the frame of the electric vehicle. In special cases where movement is necessary, the charger should be packed in foam plastic to avoid shock and vibration. 3. Charge in time: Sulfation begins after the battery is discharged, with significant sulfation occurring within 12 hours. Timely charging can eliminate minor sulfation. If not charged in time, these sulfation crystals will gradually accumulate and form coarse crystals. Ordinary chargers are ineffective against these coarse crystals, leading to a gradual decrease in battery capacity and shortened battery lifespan.

[SanClara]

Last time I tested a similar configuration on my e-scooter, a new 72V20Ah battery could run about 70 kilometers on flat roads. However, it depends on the motor power. With an 800W motor, it can go farther, but with a 1200W high-power motor, the range may drop to around 50 kilometers. If there are many uphill climbs, the range can be reduced by 30%, especially when carrying a passenger, which drains the battery faster. Insufficient tire pressure also consumes more power, so maintaining a tire pressure of 2.8 kg is more energy-efficient. Remember, in cold weather, the activity of lithium batteries decreases, so the range in winter can be over ten kilometers shorter than in summer.

[LaIker]

This depends on the usage scenario. My neighbor, a delivery guy with the same battery, weighs 70kg and rides solo. He delivers food in the city, covering 60km daily with two bars of charge left. However, after six months of use, the battery's range started to decline, and now a full charge only gets him just over 50km. If you frequently carry heavy loads or climb bridges, be prepared for the range to drop by about 20%. Also, charging habits affect battery life—don't wait until it's completely dead to charge; start charging when it's down to 20%.

[Cali]

Let's do a simple calculation: 72V × 20Ah = 1440Wh of energy. A typical e-bike consumes 15-20Wh per kilometer, theoretically allowing a range of 72-96 km. However, in reality, you need to deduct 30% for losses: controller efficiency, tire resistance, and braking losses. The actual range falls between 50-70 km. Battery lifespan is also crucial—a new battery may meet the standard, but after two years, its capacity might drop to 80%. It's advisable to install a voltmeter; when the voltage drops to 63V, it's time to recharge to protect the battery.