Hammond Group Inc.
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Battery Additives - Expander, Tetrabasic Lead Sulfate, and Electrolyte Additives

Learn more about Hammond Group’s battery additive products.

Battery Additive Products

Negative Expander

Negative expander is a specialty additive to a battery’s negative active material to improve capacity, cold cranking performance, cycle life, and charge acceptance. Hammond offers over 120 negative expander formulations tailored for specific applications:

  • Automotive Starting, Lighting and Ignition (SLI)
  • Motive Power/Traction
  • Stationary: Float and Off-grid Energy Storage
  • Golf Car, Floor Scrubber, and other deep-cycle applications
  • Motorcycle and e-Bike
  • Start-stop and Micro Hybrid Vehicles

See our Expander Application Guide to select the right expander for your application.


Tetrabasic Lead Sulfate

Hammond's tetrabasic lead sulfate (TTBLS), SureCure®, is added to a battery’s positive active material where it acts as “seed crystals” to promote uniform TTBLS during paste mixing and plate curing. More consistent TTBLS results in stronger positive plates, increased cycle life, lower paste density, and reduced material cost.

See our SureCure Application Guide to select the right product for your application.

Click this video link to see SureCure®'s function and benefits.


Electrolyte Additives

Sodium sulfate is added to the electrolyte in AGM batteries to improve rechargeability after a deep discharge. Hammond offers high-purity sodium sulfate in both powdered and tablet forms.



The leader in energy storage for over 85 years

Founded in 1930, Hammond Group, Inc. (HGI) is a specialty chemical company dedicated to advancing energy storage applications through proprietary chemistry. HGI’s extensive products and experience allow us to serve a range of markets across the globe with manufacturing facilities in the United States, United Kingdom, and Malaysia. In 2015, HGI completed a state-of-the-art Lead Acid Battery Laboratory (E=LAB²) in Hammond, IN for ongoing development of advanced battery & energy storage chemistry.



3100 Michigan Street

Hammond, IN 46323



+1 219.931.9360


Innovation is the thing that gives you the opportunity. It’s the promise of our future.
— Sally Breidegam Miksiewicz

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At Hammond Group, Inc. customers come first. Contact us to discuss our products and find out how our experience can help you be more successful.

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