• Home
  • Flooded vs Sealed Rechargeable Batteries

Flooded vs Sealed Rechargeable Batteries

This entry was posted on 02/03/2020 01:45:35 PM by Valen

Flooded vs Sealed Rechargeable Batteries

Batteries have been around since the 19th century when John Daniell invented the first practical battery called the Daniell cell. Daniell would likely be amazed at the variety and sophistication of batteries in our day.

Rechargeable batteries were invented a few decades after the original battery. A rechargeable battery can recharge when put in contact with a reverse current. Rechargeable batteries are extremely powerful for their size and makeup almost half of the worldwide battery sales.

But with so many different technologies, how can you be sure you choose the right one for your application?

In this blog, the experts at Valen take you through the differences and pros and cons of Flooded and Sealed Rechargeable batteries so you can make an informed decision.


New call-to-action


Flooded Batteries

Flooded rechargeable batteries, also known as wet-cell batteries, contain a liquid combination of water and sulphuric acid. Flooded rechargeable batteries contain a liquid that is free to move in the battery encasement. These batteries must be mounted upright so that the electrolyte does not leak out of the caps on the top. 

Flooded rechargeable batteries are decidedly more high-maintenance than Sealed batteries. 

While this may be the most conservative battery on the market, it will only reach its potential lifespan if they are maintained correctly. These batteries have a reduced life in extreme climates, where the water inside them can evaporate or freeze. The levels must be checked monthly and topped off with distilled water to ensure the longest possible lifespan. 

Note: Flooded rechargeable batteries release toxic hydrogen gas when charging. They need to be enclosed and vented to the outside to prevent this gas from being trapped and creating a hazardous environment.


Sealed Lead-Acid Batteries

Unlike Flooded rechargeable batteries, Sealed lead-acid batteries do not contain a liquid that could spill out if the battery breaks. These types of batteries are known as maintenance-free batteries.

There are 2 types of Sealed lead-acid batteries: AGM (Absorbent Glass Matting) and Gel.

Sealed lead-acid batteries have many significant advantages. The main advantages is the electrolyte is completely absorbed in the separator and thus doesn't need water added. 

Sealed lead-acid batteries also tend to charge faster than Flooded batteries. 

They require less maintenance and ventilation and can withstand varying climates better than Flooded batteries. 


Download Now: Which Battery for Which Application eBook


The Pros and Cons

Each type of battery has its pros and cons.

Flooded vs Sealed Rechargeable Batteries - table


Need advice on which type of battery is right for your application?
Ask the experts at Valen!

Every application is different, so it's always important to ensure your system will run to maximum efficiency and deliver value for money. 

The experts at Valen are proud to offer the highest level of technical support. We have a comprehensive understanding of batteries and the benefits of each technology. 

To talk to one of our knowledgeable team members, simply click here to get in touch!

Written by Valen

Recent Posts