How to add acid & charge a motorcycle battery

Written by david sandoval
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How to add acid & charge a motorcycle battery
The electrolyte solution is corrosive; therefore, it is important to wear safety gear before beginning this project. (medical gloves image by sasha from

Many motorcycle batteries are sold as "dry-charge" batteries, meaning the battery is not pre-filled with battery acid. The acid electrolyte must be poured into the battery before use. Typically, the battery electrolyte is pre-mixed to the proper acid/water ratio. After adding the acid, you will need to charge the battery before use.

Skill level:

Things you need

  • Dry-charge motorcycle battery
  • Battery electrolyte solution, included as part of the battery purchase
  • Pliers
  • Battery trickle charger
  • Rubber gloves
  • Safety goggles

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  1. 1

    Put on rubber gloves and safety goggles.

  2. 2

    Loosen the battery vent caps with pliers, and remove each battery vent cap from the battery cell.

  3. 3

    Open the electrolyte container. Carefully pour enough electrolyte solution into each battery cell until each is filled past the "Low Electrolyte" or "Fill" mark.

  4. 4

    Replace and tighten the battery vent caps.

  5. 5

    Attach the positive battery charger lead to the positive battery terminal. Attach the negative battery charger lead to the negative battery terminal.

  6. 6

    Plug a battery charger into a wall outlet and turn it on. Charge the battery for approximately two hours before use.

Tips and warnings

  • Check the battery every half hour during charging. If the battery becomes hot to the touch or the battery vents begin to bubble, turn off and disconnect the battery charger immediately.

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