How Many Amps is a Motorcycle Battery?

Amps are typically used to measure electrical current and the electromagnetic force between conductors that are transporting current. We have specific amps to start the motorcycle’s engine. However, the majority of us are unaware of how many amps is a motorcycle battery.

To start the engine, buy a battery with at least 12 amps of power, but if it’s a big engine, make sure you have a 20 amp battery. The performance capacity should range from 2 to 36 Amps/hour and can be either 6 or 12 volts based on the bike type. Set the direct current setting on your voltmeter to 12 volts to measure the battery.

Basically, the type of charger for battery recharging is determined by the amp rating. Anyway, let’s read the entire text to gain a thorough understanding of motorbike battery amps.

Battery Specification of a Motorcycle

motorcycle battery voltage

A lead-acid battery that is specifically made for motorcycle use is known as a motorcycle battery. The reserve capacity and cold cranking amps (CCA) of a motorcycle battery are its two most crucial specifications (RC). Normally, the CCA is tested at 0°F (-18°C), whereas the RC is measured at 80°F (27°C).

A motorcycle battery’s voltage, amp-hour rating (Ah), and cranking amps are further specifications (CA). You can look for further information on these specifications. Motorcycle batteries typically range in power from 15.75 to 403.2 watts.

The wattage of 12-volt motorcycle batteries normally ranges from 31.5 Watts to 403.2 Watts, which is more than that of 6-volt batteries. 6 Volt batteries produce between 15.75 and 201.6 Watts.

Understanding how electrical standards perform and how they interact is necessary. Let’s start by outlining some specifications so you can obtain relevant further information. The battery’s voltage and ampere (A), ampere-hours (Ah), and voltage (V) are our main concerns.

Motorbike Volts

  • Motorcycle batteries typically have a voltage of 6 or 12 volts.
  • Older motorcycles were built with a 6-volt battery.
  • Manufacturers of motorcycles and automobiles gradually shifted to 12-volt systems in the early 1960s.
  • Most of our bikes typically use 12-volt batteries.
  • Each battery cell in a motorcycle battery has a voltage rating of 2.1 volts, with 6 cells in a 12-volt battery and 3 cells in a 6-volt battery.
  • So, a 12 Volt battery will read 12.6 Volts, whereas a 6 Volt battery will reflect 6.3 Volts.

Bike Amp-hours (Ah)

  • Batteries are commonly measured in ampere-hours (Ah).
  • The size of the battery reduces as the ampere-hours.
  • The ampere-hour capacity of a bike battery can range from around 2.5 to 32.
  • Your battery’s capacity to transmit current for a significant length of time is reflected by its amp-hour (Ah) rating.
  • The value is calculated on 10 and 20-hour ratings.
  • For instance, a battery rated at 18 Ah or 10HR will deliver 1.8 amps of current for 10 hours.
  • Its ability to produce that electricity is unaffected by the ampere-hours.
  • A battery that has fewer amp-hours is less powerful and will damage faster.

Cold Cranking Amps (CCA) for motorcycles

  • A battery’s capacity to start a Powersports engine in cooler weather is measured by its “cold cranking amps,” or “CCA,” according to industry standards.
  • The cold climate starting ability, or CCA, of a battery, is measured.
  • CCAs represent a good statistic for measuring batteries.
  • The cold cranking amps are produced by a 12-volt battery for 30 seconds at 0°F while maintaining 7.2 volts or higher.
  • Keep in mind that a battery’s CCA value needs to be higher.
  • For instance, Harley demands at least 300 CCA.
  • Typically, larger motorcycles need higher CCA.
  • Having a 125cc single-cylinder dirt bike may require about 120CCA.

Related dirt bike: Which dirt bike batteries are reliable?

How Many Amps Are in a Motorcycle Battery?

how many volts is a motorcycle battery

Depending on the bike model, it genuinely varies. Your bicycle’s battery can be 2 amps or up to 30 amps. It depends on the motorcycle. However, smaller models have 12V 10Ah batteries, while larger models have 12V 20Ah or more.

The performance capacity should range from 2 to 36 Amp/hour and can be either 6 or 12 volts depending on the bike. Some tiny bikes with kick starters and no electric start need a little battery with a capacity of 6 to 7 amp hours to run the lights and ignition. Some of us choose lithium batteries to run our bikes.

For instance, the entire capacity of a common 1000cc motorcycle is about 12ah, but the cold cranking amps are commonly 220ah to 250ah. If we talk about Harley, you must require 28 ah for big engines.

Also Read: What does CC mean in Motorcycle?

What Amp Required to Charge a Motorcycle Battery?

Because of their higher current output, the majority of battery chargers for vehicles are not suitable. There is a maximum of 7.5 Amps that a motorcycle charger can deliver while it’s charging.

As a result, the battery should not operate at greater than 3 amps when charging a motorcycle or other small battery. It’s important to remember that your charger is similar to the same voltage at either 6 or 12 volts.

How Many Ah Is A Bike Battery?

A motorcycle battery with a 12V system has a 4 Ah capacity. Consequently, the battery can supply a current of 4 amperes for an hour or 1 ampere for four hours without necessitating a recharge.

How Are Amp-Hours Calculated For A Battery?

The amp-hour is the unit of measure that we use for this (Ah). Multiply the current (in amps) by the time needed to calculate a battery’s Ah rating in hours.

For example, a battery’s capacity is 10 Ah. If it can supply 1 amp of electricity for 10 hours. The capacity will be reduced to 5 Ah if you attempt to discharge it at 2 amps.

Rather than capacity, pay attention to discharge rates. For instance, a battery with a 10 Ah capacity and a 1 C discharge rate will have a ten-hour discharge time. The release time, therefore, will be cut in half to 5 hours if you attempt to discharge it at 2C.

Steps to Calculate

  • Determine how much electricity is required to run electronic equipment. It indicates multiplying the wattage by the number of hours. For example, 100W x 8h = 800 Wh.
  • Now, convert the wh into ah. You must do this by dividing watt-hours by voltage (12V for batteries). For example, 800Wh/12V = 66.67 Ah.
  • The calculated Ah is the least number of amp hours that your battery must have to run your machine.

Can I Use A Smaller Battery On My Motorcycle?

Yes, you can use it, but it won’t have as much power as a 7-AH battery. If you consider a 7 AH battery to have 100% power, a 5 AH battery has 71% power. The compact AGM motorcycle battery should have enough power to start the engine even in cold conditions. Remember this.

You increase your vehicle’s probability of having further engine starting difficulties by installing a smaller battery. A low-capacity battery will also often produce fewer cold cranking amps (CCA) than a battery with a larger capacity.

Can I charge a motorcycle battery at 10 amps?

When the battery voltage reaches the output voltage, a good charger with a current limit and voltage regulator will stop delivering electricity. Actually, it is possible to charge the bike battery at 10 amps. But keep in mind that a battery should never be charged at a rate of more than one-tenth of its amp-hour rating.

Can I put a bigger battery on my motorcycle?

You can use a battery with a higher capacity or Ah, but make sure the voltage is equal. While recharging will take longer, using a battery with a greater Ah will increase the device’s functioning duration on a single charge. However, 12 volts is always preferred.

What voltage should I charge my motorcycle battery at?

how to charge a motorcycle battery

Usually, a fully charged AGM battery has an open circuit voltage of between 12.8 and 13.0 volts. AGM batteries will register 12.5 to 12.8 volts when they are 75% to 100% charged. Anyway, take a look at the chart:

Battery Charging InformationEach (2.1v) lead-acid battery cell6 x Cell Standard 12-volt batteries
Minimum Charge2.15v12.90v
Trickle Charge2.25 to 2.27v13.50 to 13.62v
Standard Charge2.30 to 2.35v13.80 to 14.10v
Rapid Charge with the Risk of Gassing2.40 to 2.45v14.40 to 14.70v

Related Article: AGM vs Lead Acid batteries

What Happens If I Start a Motorcycle With a Car Battery?

We advise against using a car to jump-start your motorcycle unless it’s urgent because automotive batteries have significantly higher amperage than those on bikes. A huge automobile battery has enough power to start a bike within a few seconds without the need for the engine to be running.

Related car battery: how long do car batteries last?

How to Know When to Change the Battery of a Motorcycle?

The bike battery often has to be replaced 3 to 5 years after purchase. When the engine struggles to start or won’t run, the battery indicator displays that it’s discharged and a replacement is necessary. Additionally, rusted terminals, cracked or bulging plastic cases, and any fluid leaks, discoloration, or corroded terminals should all be looked for.

How long does it take to charge a 12V battery?

The typical charging time for a 12-volt battery is between 12 and 24 hours. Nevertheless, be careful that the temperature doesn’t rise above 125 degrees Fahrenheit. Therefore, it’s best to use the slow charging option.

What Should a Fully Charged Motorcycle Battery Read?

The motorbike can run on a battery that has been fully charged, cooled, and tested within 12 to 12.6VDC, but it won’t keep a full charge. If you find less, recharge it again.

How Often to Charge Motorcycle Battery?

Charge your battery once every 30 days. Additionally, purchase a smart battery charger to continuously maintain the battery.

Also Read: how to choose a motorcycle battery?


1. How many amps is a Harley-Davidson battery?

The 950 Amp direct replacement battery for Harley-Davidson models is perfect. For the incredibly large engines, Harleys need about 28 ah.

2. Are motorcycle batteries 6 or 12 volts?

Actually, 6-volt batteries are outdated. Presently, the batteries in all contemporary motorcycles are 12 volts, and the voltage requirements will remain at 12 volts.

3. Can you use a jump box on a motorcycle battery?

Without the need for a backup vehicle, jump packs are portable batteries that can assist in starting your bike.

4. Can a dead motorcycle battery be recharged?

Yes. Motorcycle batteries that have died can be recharged repeatedly, especially if they are high-quality batteries. Plus, whether it is a lead-acid or dry-cell motorcycle battery, it can be charged.

Final Thoughts

Okay, it’s time to conclude the entire section of the article “How Many Amps Is A Motorcycle Battery.” If you want to know about the battery amps, make sure you check the manual first, where you will get all the specifications. So, you will need 12 amps of power to ride the bike.

Our calculation process will also help you to check the amps of the battery for the bike in the future. We also talked about all the information regarding how and when you should change or use the battery. If the article benefited you, wait until we share other content.

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Hello, this is Adam Willam, the owner and author of the website- "". I have been passionate about biking since I was a child and have always been fascinated by the mechanics of how bikes work. When I became old enough, I started my own business of repairing and customizing bikes. By doing this I have quickly gained a reputation for being the go-to guy for bike repairs and customizations and have been running my shop successfully for many years.

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