What is the Difference Between VLA and VRLA Batteries? (Flooded vs Sealed)

Confused by the different types of lead-acid batteries? You’re not alone. When it comes to VLA (vented lead-acid) and VRLA (valve-regulated lead-acid) batteries, the terminology can be overwhelming. But understanding the key differences between these two technologies is crucial for choosing the right battery for your specific needs.

The Main Points:

  • Electrolyte: VLA batteries use a liquid electrolyte, while VRLA batteries use a gel or Absorbed Glass Mat (AGM) electrolyte.
  • Maintenance: VRLA are touted as having no or less maintenance than VLAs, but both still need regular monitoring and testing. Purchasing a VRLA battery will get you out of watering though.
  • Safety: VRLA batteries allow the end user to forgo watering, and as such they get the benefit of the battery not being spillable.
  • Lifespan: VLA batteries typically last longer than VRLA batteries (up to 20 years vs. 5-10 years).
  • Cost: VLA batteries are often more expensive upfront, but their longer lifespan can offset the cost in the long run.

Deeper Dive:

  1. Electrolyte: VLA batteries use a liquid electrolyte, requiring periodic topping up to maintain proper levels. VRLA batteries use a gel or AGM technology, which doesn’t require watering.
  2. Maintenance: While VRLA batteries offer reduced maintenance compared to VLAs (no watering), they still require regular voltage readings, capacity testing, and cleaning to ensure optimal performance and lifespan.
  3. Safety: It is important to handle both types with caution as they store significant energy. You get the benefit of not dealing with liquid electrolyte with a VRLA battery, alternatively it is common for VRLA batteries to be installed in enclosed cabinets and with tight spacing which can increase the risk of working on them.
  4. Lifespan and Cost: VLA batteries boast a longer lifespan, but their higher upfront cost and maintenance needs must be factored in. VRLA batteries offer lower upfront costs and reduced maintenance, but their shorter lifespan means more frequent replacements.

Choosing the Right Battery:

The best choice for you depends on your specific needs and priorities. Consider factors like:

  • Application: Where will the battery be used? VRLA batteries may be preferred for smaller footprints due to their sealed design.
  • Maintenance: How much time and effort can you dedicate to battery maintenance?
  • Budget: Can you afford the higher upfront cost of a VLA battery in exchange for its longer lifespan?
  • Lifespan: How long do you need the battery to last?

Expert Help:

Navigating the world of batteries can be complex. If you’re unsure which type is right for you, consult with a battery expert who can assess your specific needs and recommend the best solution.

Additional Resources:

Check out our Reserve Power product page where you can filter on options such as VLA, VRLA, NiCad, and Lithium for narrowing down your product choice.  

VLA-or-VRLA