Can You Use an Extension Cord With a Battery Charger?

A battery charger is a device that stores power and then converts it back to the electrical current necessary to charge batteries. It takes electricity from an alternative source, such as a wall outlet, and converts it into Direct Current (DC) electricity.

Extension Cord Wattage Chart

Cord Length Up to 16 Gauge (AWG) Up to 14 Gauge (AWG) Up to 12 Gauge (AWG) Up to 10 Gauge (AWG)
Up to 50 Feet 13 Amps 15 Amps 20 Amps 30 Amps
Up to 100 Feet 10 Amps 12 Amps 15 Amps 20 Amps
Up to 150 Feet 8 Amps 10 Amps 12 Amps 15 Amps
Up to 200 Feet 7 Amps 8 Amps 10 Amps 12 Amps

Can I use an extension cord with a car battery charger?

Yes, using an extension cord to car battery is acceptable. However, you need to ensure that the wattage of the extension cord is compatible with the wattage of the battery charger. You can find this information in the product specifications for your battery charger.

You should also pay attention to the gauge of your extension cord. If it is too small for the charger’s current (ampacity), you could overload and cause an electrical fire or burn out your car battery charger. To be safe, use a heavy-duty extension cord that matches or exceeds what is recommended in the charger’s owner manual.

If you are in doubt, call an electrician to help with this issue. If you cannot afford one, do not risk it, and don’t use an extension cord when charging your battery. You could damage or shorten the life of both devices involved if they overload together.

Do extension cords ruin chargers?

An extension cord can be used with a battery charger as long as the wattage of the cord does not exceed the wattage of the battery charger, and it should be an outdoor-rated cord if you plan to use it outside. Otherwise, you could damage your equipment. Always use caution and be aware of potential fire hazards.

If the extension cord is too long for the device to get electrical current by connecting to an outlet closer to the device, this may create a voltage drop. Voltage drop means your device will take less energy out of the charger to charge appropriately. This could lead to a situation where the charging takes more slowly or not at all.

Can I plug a battery charger into a surge protector?

It is not safe to plug the battery charger into a surge protector. Surges and fluctuations can occur at any time and damage your device. The best way to protect your devices from surges or electrical spikes is by using a power conditioner or uninterruptible power supply (UPS).

A UPS provides consistent voltage so you can keep your devices running during a power outage. Surge protectors can help minimize the risk of damage to your devices, but they are not 100% effective.

If you use a surge protector, ensure it has a good rating and is properly plugged into an outlet. If unsure of this procedure, it is best to consult a professional. It is the safest way to protect your devices.


If you take the necessary precautions, you can use an extension cord with a battery charger. You should always consult the owner’s manual of your specific device to know how much current this model requires for it to be safely charged. Some chargers may require a dedicated outlet rather than an adapter to function properly. This way, you’d ensure that it is compatible with the cord and the adapter before attempting to charge your item using an extension cord.

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About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.