how to recondition a 12v battery

Reconditioning it, on the other hand, restores the battery to its full capacity even once it's dead. What type of batteries can you recondition? Your ...

how to recondition a 12v battery

how to how to recondition a 12v battery for

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By Cekpi7 in WorkshopEnergy

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Introduction: How to Revive Old Lead Acid Batteries

By Cekpi7By Cekpi7
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About: My name is Alen and i study electronics engineering. I love to make anything that needs electricity, hack and mod things or building anything AWESOME... More About for 1 last update 2020/05/30 Cekpi7 »More About Cekpi7 »

If you are like me you probably have old lead acid batteries sitting somewhere probably discharged

If you dont use lead acid battery always charge it before and recharge it every 3 monts

how to recondition a 12v battery 🔴how to how to recondition a 12v battery for I ve tried this method on maintenance free lead acid, sealed lead acid and lead acid batteries , only difference is that maintenance free and SLA have hidden caps

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Step 1: You Will Need

-Multimeter

-Adjustable PSU or Taper Charger (Smart chargers wont work)

-Dead battery

-Distilled water (you can also use rain water)

-Rubber gloves

-Screwdriver

Optional

-Flashlight

-Super Glue

-Paper towel

-Syringe

Step 2: Measure Battery Voltage

Connect multimeter to your battery and check voltage

Your battery shoudnt be lower than 11.8v (30%) in open circuit

If you read lower than that you will need to revive it if its higher than that try to just charge it

100% = 12.73 the 1 last update 2020/05/30 v
90% = 12.62 v 100% = 12.73 v
90% = 12.62 v

80% = 12.50 v

70% = 12.37 v

60% = 12.24 v

50% = 12.10 v

40% = 11.96 v

30% = 11.81v

20% = 11.66 v

the 1 last update 2020/05/30 10% = 11.51v10% = 11.51v

Step 3: Inspect the Cells

Place paper towels on your working areas

Now if you have SLA or maintenance free battery you will need to remove lid with screwdriver

Put on gloves and remove caps

how to recondition a 12v battery 🔴how to how to recondition a 12v battery for Do this in well ventilated area

Wipe any wet spots with a paper towel

Then look inside cells and you should see white fabric that is dry

If you see brown fabric with white lumps your battery is probably sulfated and your chance of reviving battery is really bad

Step 4: Add Water

Take a syringe and fill each cell with water and look if fabric is absorbing water

Slowly shake battery and let it rest for 10 minutes

Step 5: Turn on Your PSU

Now you will need to connect your multimeter to show you how much battery the 1 last update 2020/05/30 is drawingNow you will need to connect your multimeter to show you how much battery is drawing

Set your multimeter to 10A and connect it in series with charger and battery

how to recondition a 12v battery ⭐️how to how to recondition a 12v battery for When you connect it to the battery an it should draw 100-200mA

how to recondition a 12v battery ☑how to how to recondition a 12v battery for Thats sign of dead battery

Set your psu to 14v or connect your charger and let it sit for day or two

After that your battery should for 1 last update 2020/05/30 draw 500-1000mA After that your battery should draw 500-1000mA

Then just leave battery and calculate how long battery should charge

Ah capacity = Amps that your battery is drawing x hours

For my battery 8Ah = 0.39A x 20,5 h

Step 6: Testing Battery

Now leave your battery for 1h and hook it up on car hadlight or any 12v bulb

Voltage the 1 last update 2020/05/30 of battery shoudnt drop lower than 12vVoltage of battery shoudnt drop lower than 12v

Step 7: Edit: 28.04.2019

At the time i wrote this instructable i was 15, i didn''s about 4y old) which is way too low for 7Ah battery and second one got 4424mAh which is kinda fine. I opened them up, instead of distilled water i used sulfuric acid that i got from old lead acid battery. I used pulse charger that i made and first battery didn''t say that pulse chargers (or desulfators) work but in my experience they did help with two battery while i had no luck with third one. I also tried simple 12V transformer and bridge rectifier and i had no luck bringing that first battery to life, it simply got hot and voltage dropped even further down to 6V which is a sign that cells are most likely damaged.
Desulfator/Pulse charger is simple 555 timer with 1khz signal turning mosfet on and off (1ms turn on time) with about 18V pulses up to 10A.
TL:DR
Method shown in this instructable works but your result will vary a lot. You might have luck and restore your battery or it may be damaged way beyond repair. Pulse chargers may work but if your battery is beyond repair just get a new one (you will also get discount by returning old one when buying new). Capacity will also vary, some batteries might be close to original capacity but if plates or electrolyte are bad it will have low capacity.

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    34 Discussions

    0
    Mjtrinihobby

    how to recondition a 12v battery 👍how to how to recondition a 12v battery for 3 years ago

    I know you put a lot of passion and effort into this project. I commend you on this. However when lead acid batteries fail, regardless of the variant, they simply cannot be revived and expected to produce even 40% of their original capacity. They are truly disposable after failure. Also, do not interfere with lead acid battery insides; you don''t use 1 years. after
    charging its not save power as it should. the voltage was 3.6V and it
    dies after 10Sec. i collect some rain water and clean it with cotton
    filter. refill the 6 cells and charge the battery for 5H. in first hour
    it takes 0.3 ~ 0.9A and in next hours 2.6Amps. is it normal? what was my
    mistake? the voltage is 7.78 now and its not die fast. it can provide
    7.78V for a LED lamp almost 3hours. what should i do to make it 12V or
    near 12?

    0
    DanielC817

    Reply 2 years ago

    buy a replacement battery or spend the extra money to purchase the acid necessary to properly have a specific x to y ratio of water to acid.

    If you keep adding water, you''t be low. If you have to add water you haven''t forget to wear goggles. I have a SLA I can't wait to try this on. Thanks.