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How To Revive Sealed Lead Acid Batteries



You might think these things are just pieces of junk in your garage, but you can turn things around if you could actually learn how to revive dead batteries. You can thank yourself later for not throwing away old hardware around the house that can prove useful with a little work.

Revive Dead Batteries | Restore Sealed Lead Acid Battery

The only reason you’re not using a dead car battery is due to its inability to provide the amperage to start a car. The truth is, they’re still useful for other pieces of equipment in your house like small low voltage devices. You could use it to power a small fan, a desk lamp, or even for emergency lighting. But first, you need to know how you can revive dead batteries. One of the most common batteries is VRLA (Valve Regulated Lead Acid Battery) and you’ll soon learn how to revive it as you read on.

What You Will Need:

  • Dry Cloth
  • Razor
  • Flat-Head Screwdriver
  • Water
  • Battery Charger
  • Meat Syringe (Optional)
  • Multimeter

Let’s Get To Work!

Hoffman Richter Knives

Step 1: Clean the Battery

Clean the Battery | Revive Dead Batteries| How To Revive Sealed Lead Acid Batteries

Clean the Battery | Revive Dead Batteries| How To Revive Sealed Lead Acid Batteries
The first step in recovering a battery is to clean up the outer casing. Spray some biodiesel, olive oil, or kerosene, then wipe it with a dry cloth. You can skip the cleaning if you want, but it’s always good to start working without the mess.

Step 2: Remove the Top Cover

Remove the Top Cover | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries

Remove the Top Cover | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries
Go around the edge of the top cover using a razor blade to the point of being able to detach it. You could also use the razor to lift the cover. Please be extra careful when holding the razor. As soon as you see a lift, slowly switch to a screwdriver. Gently raise the top by working the screwdriver under the case.

Step 3: Fill the Cells with Water

Fill the Cells with Water | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries

Fill the Cells with Water | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries
Take the caps off so you can fill each cell with water. You can use a meat syringe to fill a single cell with 20 to 30 milliliters of water. A dry battery usually takes one full syringe, but it’s okay to use any method you’re comfortable with as long as you completely fill each cell.

Step 4: Start Charging the Battery

Start Charging the Battery | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries

Start Charging the Battery | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries
You can start charging the battery now. This demonstration makes use of Da Pimp charger, which is also a portable battery tester. Place the leads for the DC side correctly on the battery. It’s as easy as “black to black” and “red to red.”

Step 5: Leave the Battery Charged for 15 to 20 Minutes

Leave the Battery Charged for 15 to 20 Minutes | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries

Leave the Battery Charged for 15 to 20 Minutes | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries
You may see a really bad voltage reading before you start charging the battery. Let the charger work on the battery for 15 to 20 minutes then check the voltage reading again. If the reading shows pulsing signs, try to give it 15 minutes more until the voltage reading stabilizes.

Step 6: Check the Voltage Reading of Each Cell

Check the Voltage Reading of Each Cell | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries

Check the Voltage Reading of Each Cell | Revive Dead Batteries | How To Revive Sealed Lead Acid Batteries
Now, you can turn off the charger and check the voltage reading of each cell. At this point, you will know if any of the cells are dead or weaker than the others. With the use of a multimeter, set it to voltage DC with the positive probe on the positive terminal of the battery and dip the negative into the acid for each cell. You’ll get different readings, but it will let you know if any of the cells are dead.

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That’s just about all needed to be done to revive a dead lead acid battery. Easy work for anyone!

Here’s the full video by The Good Life Lab on recovering an old sealed lead acid battery:

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So there you have it! Reviving dead batteries is a handy skill to learn and it won’t take much of your time to recover an old lead acid battery. Finding a good use for things sitting at the corner of your garage is neat. You can use the battery as a power source for a lighting system in your house or some devices. You could also come up with your own brilliant idea of utilizing the battery if you want.

Have you tried to revive dead batteries? Share your experiences in the comments below!

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