How to Safely Install a Battery Tender (Trickle Charger)

Oct 2, 2022


Welcome to Grafco Electric, your trusted source for electrical solutions. In this comprehensive guide, we will provide you with detailed instructions on how to safely install a battery tender, also known as a trickle charger, to ensure the optimal performance and longevity of your battery.

Why Install a Battery Tender?

A battery tender is a must-have accessory for anyone who wants to maintain their battery's charge during long periods of disuse or storage. It is particularly useful for vehicles or equipment that are not frequently used, such as motorcycles, classic cars, or boats.

Step-by-Step Guide

Step 1: Gather the Necessary Tools and Equipment

Before you start the installation process, make sure you have the following tools and equipment:

  • Battery tender/trickle charger
  • Socket wrench
  • Wire brush
  • Eye protection
  • Protective gloves

Step 2: Safety Precautions

Prior to installing the battery tender, it's important to take some safety precautions:

  • Ensure that the ignition switch and all electrical accessories are turned off.
  • Wear protective gloves and eye protection to prevent any potential injuries.
  • Remove any metal jewelry or wristwatches that may accidentally come into contact with the battery.

Step 3: Locate the Battery

Locate the battery in your vehicle or equipment. Depending on the make and model, the battery can typically be found under the hood, in the trunk, or under a seat. Refer to the owner's manual if you are unsure about the exact location.

Step 4: Prepare the Battery for Installation

Before connecting the battery tender, it's crucial to clean the battery terminals using a wire brush to remove any corrosion or debris. This will help ensure a solid connection and maximize the charging efficiency.

Step 5: Connect the Battery Tender

Follow these steps to connect the battery tender:

  1. Identify the positive (+) and negative (-) terminals on the battery.
  2. Attach the red (positive) clamp of the battery tender to the positive terminal of the battery.
  3. Connect the black (negative) clamp of the battery tender to the negative terminal of the battery.

Step 6: Plug in the Battery Tender

Once the battery tender is connected to the battery, plug it into a wall outlet or an appropriate power source. Ensure that the power source is grounded and offers the necessary voltage for the battery tender to operate.


By following these step-by-step instructions, you have successfully installed a battery tender (trickle charger) for your vehicle or equipment. This will help maintain the charge of your battery and ensure it remains in optimal condition, ready for use whenever needed. For any further assistance or electrical solutions, feel free to contact Grafco Electric, your reliable partner in the electrical industry.