# FAQ: Motorcycle Battery Voltage When Running?

## What voltage should a motorcycle battery read when running?

You can test the bike while it is off to see if the battery sits around 12.6 volts at rest, or you can run the bike and test voltages through a range of RPMs. However, there are some signs a battery is dying and needs some attention. A good battery should read between 12.4 to 12.6 volts, 12.6v being optimal.

## What should my battery voltage be while running?

Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights.

## What is the normal voltage of a motorcycle battery?

A healthy 12 volt motorcycle battery should maintain a range from 9.5 – 10.5 volts under the load, for a good 30 seconds straight. If the battery begins to hold and then steadily declines, there is a problem. If the voltage drops to 0 volts, there is a problem. We call this, the open cell.

## Does a motorcycle battery charge while running?

Yes, motorcycles charge the battery while the engine is running in the same manner in which a car charges its battery.

## Will a motorcycle run with a bad battery?

Yes a bad battery can make motorcycles not run well, shorted cells in the battery will cause the voltage coming from the alternator to get shunted to ground, eventually as more cells short out this will drop the voltage low enough that it will affect the fuel pump and the ignition coils.

## How do I know if my motorcycle voltage regulator is bad?

You’ll note signs right away like poor starts, fluctuating meter readings, and dimmed headlights. around 13 volts, the bike will start to drain the battery. When this happens, it’s only a matter of time before the engine stops completely.

At 12 volts your battery is not healthy. If you fully recharge the battery & it doesn’t hold an open circuit voltage of 12.4+ volts then it can be considered faulty! Read the voltage as you try to start the vehicle. The voltage will drop considerably if it’s defective but it may read 12 volts at no load.

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## Is 11.9 volts enough to start a car?

A flat battery can show 12 volts, but not be good enough to start a car. 11.9 v indicates the battery is completely discharged. Anything under 12.2v means the battery is in a state of discharge, and a healthy battery should show 12.6v in a static state.

## Is 14.7 volts too high?

Charging voltages over 14.7 volts can prematurely dry the battery by boiling out electrolyte, and increase risk of a battery hydrogen gas explosion. Less than 14.3 would be a “weak” alternator or regulator. Much less than 14.2 at a fast idle is bad wiring, bad alternator or regulator, or a bad connection or fuse link.

## How do I know if my motorcycle battery is bad?

If your kickstand is up, and the bike won’t fire, this switch may be faulty. Consider, too, that if your headlight comes on and is typically bright, and your horn sounds normal, a dead battery is unlikely. Telltale signs that the problem is the battery include weak or nonfunctioning lights and horn.

## Why do motorcycle batteries die so fast?

All too often, motorcycle batteries die young, murdered by neglect. Dehydration, improper charging, and a slow discharge during storage all shorten a battery’s life. To prevent these draws from killing your battery, you could disconnect the battery, but even if there is no load on them, batteries self-discharge.

## How do I know if my deep cycle battery is bad?

A reading of approximately 10.5V should be revealed when a deep cycle battery is fully discharged (dead flat). It usually means that the battery has been left in storage for too long without a charge. Or, it could be that it was left with a load running on it that does not have an automatic cut-off.

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## How long should I ride my motorcycle to charge the battery?

Does a bike battery charge while riding? Yes. That’s what is designed to happen, so if your alternator and battery are in fine fettle, a 30 minute ride should easily be enough to top up the battery.

## Does the battery charge while idling?

Do Car Batteries Charge While the Engine Is Idling? The answer is ‘YES’, yes the car battery does charge while the engine is idling. Then the alternator is producing AC current, thereby charging the battery while your car is idling.

## Is it bad to let a motorcycle idle?

Many motorcycles especially older ones are air cooled. They require the air going past to keep keep the engine at the correct temperature. It’s bad to allow any motor vehicle to idle long term, yes. You will be burning fuel unnecessarily and throwing out unwanted emissions into the air.