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  • Yakub Ansari

Sealed batteries Vs Flooded batteries

Updated: Jan 1

Both sealed and flooded are the member of lead-acid battery family. Both batteries are rechargeable and use chemicals reactions to store electricity. However, flooded batteries are one of the oldest and most popular versions of lead-acid batteries and available since 1859. On the other hand, sealed batteries are developed in 1930.

Sealed batteries are also called Maintenance-free batteries or Valve-regulated lead-acid (VRLA) batteries or Sealed Maintenance-free (SMF) batteries.
And Flooded [FLA] batteries are also called Wet batteries.

Besides lots of similarities, there are lots of differences between both types of batteries. And in this blog, you will all the difference between them.


Sealed Vs Flooded battery

The electrolyte of flooded batteries is in liquid form and required a regular water level up. Whereas the electrolyte of sealed batteries is gel form or acid socked glass mat form. Hence sealed batteries doesn’t require any water up and these batteries can be placed upside down or on their side.


1. There are two versions of sealed batteries available, that is AGM [Absorbent Glass Mat] battery and the Gel battery.


2. Sealed batteries have a low self-discharge rate as compared to flooded batteries. Flooded batteries have a discharge rate of up to 15% per month. Whereas sealed batteries have a 1-3% of discharge rate.


4. Sealed batteries are expensive than flooded batteries.


5. Sealed batteries are spill-proof/leak-proof, hence also called non-spillable batteries. And this makes them easy to transport.


6. Flooded batteries have a high energy density, whereas both types of sealed batteries have low energy density.

Energy density means the amount of energy stored in the battery of a given size or weight.

7. Sealed batteries have high power density than flooded batteries.


Power density