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Motorcycle Battery Reading & Maintenance

In this guide, I will share information about motorcycle battery reading and maintenance.

Battery Maintenance

Battery reading when rev-ed at 2K RPM – Indicates Healthy battery

Storing Your Battery

If you’re not using your bike regularly, I would suggest that you remove the battery cables to eliminate drain from electrical components and you should also consider charge the battery every two weeks or so.

For longer battery life, remove the battery from your bike and charge it to 100% or full. It is adviseable to charge your battery every month if you’re storing your bike at temperatures below 60° . If stored in a warm area (above 60° F), charge every two weeks.

Important: Before performing any inspection on your battery, make sure that there are no open flames or possibility of sparks around the battery and absolutely no smoking. Always wear eye protection, protective gloves and clothing.

Cleaning of the battery terminal

Clean the battery terminal when it is dusty or rusted.

1. Set the ignition switch“ OFF” position.
2. Disassemble the front seat, disassemble the ( +) positive battery wire after the ( -) negative battery wire. Remove the battery.
3. Clean the terminal. If there is white dust, clean it with warm water.
4. Assemble the battery wires and grease the terminal lightly.

When your battery is clean, it’s time to check the state of charge. When using a voltmeter, the battery terminal voltage should read at least 12.0 volts. If your voltage is below this or you’ve adjusted the electrolyte levels, a boost charge is required.

Battery Reading Guidelines

The reading guideline below may not be entirely accurate but it will give you some rough idea on how the battery measurement should read.

Ignition ON With Engine Off

12.0 – 12.9V: Normal (Healthy)

11.7 – 11.9V: Weak Battery. You should charge/replace it.

11.6V & Below: Bad battery. Change it especially if you’re using electric starter

Engine ON & Rev above 2000 RPM

14.6 & Above: Bad rectifier/regulator.

13.0 – 14.5V: Normal (Healthy)

13.0V & Below: Minor electrical circuit issues such as, incorrect wattage of light bulbs, alternator (Magnetic coil, fuel coil) or charging circuit fault etc


Proper maintenance and regular checking on your battery will ensure that your bike is in good condition. I am sure you don’t want to stuck somewhere due to the problems with the battery.

Do you have Voltmeter installed on your bike to monitor your battery’s health?

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Khor Eng Khian

What the minimum battery leakage on this bike?1-2mA is normal?

Khor Eng Khian

my hyosung is indicate 02.110mA current leakage when in key off position,after i check the leakage problem is come from the digital meter wth taco meter!! when i disconnect the socket of DM,the current leakage is drop to 0.0003mA,for my acknowledge most bike current leakage is not more then 0.1mA,so is that my bike will drain of the battery when overnight?

Hazim Habush

hello Rider Chris i want to ask is there any difference between coil magnetic for naza blade 250 efi and gt 250 or can work on both ?

Rohan Krishna

I just charged my battery coz it was unable to start( I’ve parked it for a while without using it). But after the battery is fixed and I started riding, the bike makes battery on sound ( the sound which comes when you turned on the ignition ). Is this normal?

Rohan Krishna

Thanks for your swift reply. I’ll get to it n be back!


There are a error.

5000 rpm to 10500rpm the max voltage is 15.0v, 15.4v is dangerous and can damage electrical components