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Electric Dirt Bike Battery Calculator: Watt-Hours, Charge Time, Range

Electric dirt bike battery calculator: volts x amp-hours gives watt-hours, amp-hours / charger amps gives minimum charge time, and the range claim gives Wh per mile.

By Mini Bike ReviewPublished 2 min readHow we research
An electric dirt bike battery pack on a garage bench beside its charger

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An electric dirt bike battery's stored energy is volts times amp-hours: the Windone RS5's 48V 22.5Ah pack holds 1,080 Wh, and its 45 mile range claim works out to 24 Wh per mile (per the Amazon listing). Watt-hours are the fair way to compare a 48V pack with a 52V one.

The calculator also gives a minimum charge time (amp-hours divided by charger amps) and shows what a maker's range claim implies. CPSC staff advise using only chargers certified for the device.

What does this battery really hold?

V
Ah
A
mi

Stored energy

1,104 Wh

Volts x amp-hours

Minimum charge time

4.6 h

Ah / charger amps; real charging is longer

Implied by the range claim

24.5 Wh/mi

Watt-hours / claimed miles

Watt-hours are volts times amp-hours, the fairest way to compare packs of different voltages. The minimum charge time is amp-hours divided by charger amps; the last part of a charge is slower, so expect longer. Watt-hours per mile is worked out from the maker's range claim: a lower number means the claim assumes gentle riding. Use only the charger certified for your bike, as CPSC staff advise.

The method

  1. Stored energy (Wh) = battery voltage x amp-hours.
  2. Minimum charge time (h) = amp-hours / charger output in amps. Real charging takes longer because chargers slow down near full.
  3. Implied efficiency (Wh/mi) = watt-hours / the maker's claimed range. A low figure means the claim assumes gentle riding.

Worked examples from listed specs

Battery and range per each Amazon listing; energy and Wh/mi are our arithmetic
BikeBatteryEnergyRange claimImplied
Windone RS548V 22.5Ah1,080 Wh45 mi24.0 Wh/mi
ESKUTE48V 23Ah1,104 Wh53 mi20.8 Wh/mi
YOFAST 2600W48V 23Ah1,104 Wh35 mi31.5 Wh/mi
Tietie 2000W48V 20Ah960 Wh50 mi19.2 Wh/mi
ABKDO 4000W48V 23Ah1,104 Wh40 mi27.6 Wh/mi
Tasaca T50052V 30Ah1,560 WhNot used-

Three bikes with the same 1,104 Wh pack claim 35, 40 and 53 miles. The battery is the same size; the claims assume different riding. Compare watt-hours, then treat range claims as best-case.

Charge time

YOFAST lists 6 to 7 hours for its 48V 23Ah battery and ESKUTE lists 6 hours for the same size; 79BIKE lists 3 hours at a 10 A charge current (per the Amazon listings). At 5 A, a 23 Ah pack needs at least 4.6 hours by the formula, before the slower final stage.

Battery safety

From Jan 1, 2021 to Nov 28, 2022, CPSC received reports of at least 208 hoverboard, e-scooter and e-bike fire or overheating incidents in 39 states and at least 19 deaths, per its 2023 letter on e-mobility battery fires. CPSC's consumer advice: use only e-mobility devices certified by a third-party lab, only chargers certified for the device, only battery packs the maker recommends, and never modified packs or reused cells. Look for UL 2272 or UL 2849 certification: Windone lists UL 2272 for the RS5.

Next: the best electric dirt bikes, gas vs electric dirt bikes and electric dirt bikes for teens.

Frequently asked questions

How do I calculate electric dirt bike battery capacity?

Multiply volts by amp-hours for watt-hours. A 48V 22.5Ah battery holds 1,080 Wh; a 52V 30Ah battery holds 1,560 Wh.

How long does an electric dirt bike take to charge?

At least amp-hours divided by charger amps, plus time for the slower final stage. Listings here give 3 hours (79BIKE at 10 A) to 6 to 7 hours (YOFAST 48V 23Ah).

How far can an electric dirt bike go on a charge?

Listed claims for 48V packs here run from 35 to 53 miles, but those are best-case. Hills, speed and rider weight cut real range.

Is 48V or 52V better on an electric dirt bike?

Compare watt-hours, not volts alone. A 52V 25Ah pack holds 1,300 Wh and a 48V 23Ah pack 1,104 Wh; the higher-energy pack goes farther at the same use.

What certification should an electric dirt bike battery have?

CPSC staff point to UL 2272 and UL 2849 and advise using only devices certified by a third-party lab and only certified chargers.

Sources

  1. CPSC staff letter to UL STP 2272 and STP 2849 on e-mobility fire incidents (Feb 10, 2023), U.S. Consumer Product Safety Commission
  2. All-Terrain Vehicle Safety, U.S. Consumer Product Safety Commission

Cover image: Illustration: Mini Bike Review (AI-generated)

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