How to charge a motorcycle battery without a charger

Last Updated
How to charge a motorcycle battery without a charger

How to charge a motorcycle battery without a charger

Many of us have wondered whether we can charge our motorcycles’ batteries without a charger.

Most of us have been inconvenienced by a flat bike battery, and recently the same happened to me. I was most perturbed since it was a late night and my bike doesn’t have a kickstart!

After hours it is difficult to find anyone to give your battery a jump. So I was fortunate when the engine cranked with a push start and I made it home unscathed.

However, it did make me wonder how I could charge the battery at home using a different method of charging …

The equipment

First and foremost let us discuss tools that will be needed to fully charge a motorcycle battery:
i. Procure a flat-headed screwdriver.
ii. Obtain a spanner (Size 10).
iii. You will need distilled water.
iv. Next, take around a 1-meter length of thick wire.
v. One funnel
vi. Take an insulation tape of any color (it can be black or red according to your own liking).
vii. Take the UPS (Uninterruptible Power Supply) of your PC – it will act as the power source for our purpose.
viii. Also ensure that you are wearing protective aids like gloves, goggles and overalls since we will be dealing with acid.

The process
  1. First of all, you need to safely remove the battery from the battery cover located on the right side of the bike. This can be easily done by removing the nuts, which will release the battery from its holder.
  2. After the battery is detached from the holder, remove all of the rubber caps carefully and also remove all of the screws. Keep them safe, since after the whole process is completed they need to be put back on the battery.
  3. Now we need to clean the battery properly before continuing – remove any dust or dirt. 
  4. After cleaning, check the water level in the battery. If it is below the required limit use the funnel to top it up with distilled water.
  5. Now we can connect the UPS to the battery to charge it. For proper connections use alligator clips, since they fit tightly to the terminals and are easy to remove once charging has completed.
  6. Once charging is complete, usually after around 8 hours, remove all the connections carefully. Finally, tape both the charging terminals using insulation tape and reinstall the battery to the motorcycle.
  1. You should always be careful while checking the water level in batteries. If it is a ‘thick’ battery, take it to a dark room and put a light source on the sidewall of the battery – this will help to check the water level without any confusion.
  2. Whether you make the connections to terminals using insulation tape or alligator clips, care should be taken. Loose connections will prevent the battery from charging and may, in extreme circumstances, even result in an electric fire.
  3. Dealing with the acid in a battery should be done with the utmost care. Even a little acid contact can cause the skin to burn. If someone comes into contact with any acid, immediately rinse the contact area with plenty of water to neutralize the acidic effect.
  4. One shock from this voltage can be enough to have an adverse effect on the human heart.
  5. Always refer to the guidelines in the manual for the required charging time of the battery.

Some important points that should be kept in mind during this whole charging process are:

  1. During the process of charging one should leave any rubber caps covering water tubes open.
  2. Carry out in an area where there is proper ventilation.
  3. When the UPS is connected to the battery use it in standby mode – if we press the ‘power on’ button, the direct current will flow across the UPS, leaving the battery uncharged.

Some of the other ways to charge bikes’ battery without the charger are:

Power adaptor

It is possible to use a 12V wifi routers’ power adapter as a power source.
This method will not harm the battery since the wifi adapter possesses a relatively small current.

Precaution: do not connect 100v-230v directly as it could damage the battery and/or power source or, in extreme cases, cause the battery to explode.

Use the battery of another vehicle

If you are on the road you can ask any nearby vehicle for help. Use alligator clips / jump leads for connections and charge your battery enough to get back to your home.

Note that 1 hour of continuous power supply from the running vehicle is needed to charge the battery to 60%.

Like How to charge a motorcycle battery without a charger? Click here for our reviews of household battery chargers

Steve Brown


Steve is a gadget enthusiast who's always been intrigued by batteries. The founder and editor of Battery Chargers Info, he's assembled a group of like-minded experts to cover every facet of portable power His aim is to help you learn more about your favorite gadgets and their batteries so you can maximize both their performance and their life.

Learn to Revive almost any Battery from Home!

If you are sick and tired of paying exorbitant fees to replace your batteries, this secret method to recondition almost any battery can save you BAGS of MONEY. Click this ad NOW to find out how!

Click Here