Connect car battery charger

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Part 1

Preparing to Charge Your Battery
  1. Read the specifications for your battery. Start with the owner’s manual if your battery is original to the car. This should answer important questions such as what the voltage requirements are for charging your battery and whether or not you should remove it from the vehicle before charging. Almost all car batteries are 12 volt, but the charging voltage can vary depending on the amount of charge your battery currently has and the temperature.
  2. Read the specifications for your battery charger. There will be a manual with your battery charger that provides details for the appropriate use of the charger.
  3. Choose a well-ventilated work area. Working in a well-ventilated area will help dissipate the hydrogen gas that batteries generate from the sulfuric acid within their cells.Image titled Hook Up a Battery Charger Step 5 Also, make sure to keep any other volatile substances, such as gasoline, flammable materials, or ignition sources (flames, cigarettes, matches, lighters) away from the battery at all times.
  4. Put on protective gear. Glasses, gloves, and other protective gear is a good precaution. Hydrogen released within the battery quickly converts to a gas and expands, this can cause the battery to explode if venting mechanisms fail. Once the hydrogen is in contact with the oxygen in the air, it is highly flammable and can be ignited even by static electricity.
  5. Turn off all vehicle accessories. These accessories draw power from the battery and should be turned off before removing or charging the battery.
  6. Locate your battery. Most batteries will be found either under the hood of the vehicle or in the trunk. It is also possible that your battery may be under the rear seat, and sometimes the battery can only be accessed from underneath the side of the car.
  7. Identify the positive and grounded posts on your battery. One post will be grounded by being connected to the vehicle’s chassis.Image titled Hook Up a Battery Charger Step 3 The other post will be “hot, ” meaning that current will flow from it to the grounded post in a circuit. There are a few ways to tell which is which:
    • Look for labels such as “POS, ” “P, ” or “+” for the positive post and “NEG, ” “N, ” or “-“ for the negative (grounded) posts on the battery case.
    • Compare the diameters of the battery posts. For most batteries, the positive post is thicker than the negative post.
    • If the battery cables are connected to the posts, note the color of the cables. The cable connected to the positive post should be red, while the cable connected to the negative post should be black.
  8. Image titled Hook Up a Battery Charger Step 6Disconnect the vehicle battery cables. Disconnect the grounded terminal (negative), then the ungrounded terminal (positive) before removing the battery.
  9. Remove the battery from the vehicle. Some vehicles require that you remove the battery before charging, others do not. Follow the instructions provided in your owner’s manual or with your battery.
    • Typically if the battery you’re charging is for a boat, you must take the battery out of the boat and charge it on shore. You can charge the battery inside the boat only if you have a charger and other equipment that is specifically meant for doing so.
    • Using a battery carrier to move the battery from the vehicle to the place where you will connect it to the charger is recommended. This will avoid putting pressure on the battery ends and forcing battery acid out of the vent caps, as might happen if you carry it in your hands.
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Battery Tender Battery Tender 081-0069-6 Ring Terminal Harness with Black Fused 2-Pin Quick Disconnect Plug
Automotive Parts and Accessories (Battery Tender)
  • 2 Feet cord adaptor
  • Plugs into all Deltran Battery Tenders
  • Convenient for hard-to-access batteries
  • Adaptor plug is compatible with most heated suits for motorcycles or snowmobiles
  • This ring terminal harness includes a 7.5-amp fuse and is 2 feet in length

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