valve regulated lead acid battery How to Revive Old Lead Acid Batteries
If you are like me, you may have old lead-acid batteries placed somewhere and you may discharge if you do not use lead-acid batteries. Monts I have tried this on maintenance free lead acid, sealed lead acid and lead acid batteries, the only difference is that maintenance free and SLA have hidden hatsMultimeter -
Adjustable PSU or cone charger (smart charger not working )-Dead battery-
Distilled water (rain can also be used )-Rubber gloves-
Optional screwdriver-Flashlight-Super Glue-Paper towel-
Connect the multimeter to the battery and check if the battery is less than 11.
Open on lunar January 5 (30%), if you look at it then you will need to restore it if it is charged monthly it100 % =. 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 10% = 11.
51 vPlace paper towels are placed in your work area. If you have SLA or maintenance free batteries, you need to remove the cover with a screwdriver on your glove and remove the capsule in a well ventilated area. Use and then look at the cells inside and you if you see a brown fabric with a white block, your battery may be sulfuric acid, and your chances of restoring the battery are really bad. Take a syringe and fill each battery with water to see the fabric absorb water and shake the battery slowly: Let it rest for 10 minutes. Now you need to connect your multimeter and show you how many batteries your multimeter has. Set your multimeter to 10A and when you connect it to it should draw 100-
200 signs of mAThats dead battery set your psu to 14 v or connect your charger and have it put for a day or two your battery should consume 500-
1000 mA then leave the battery and calculate how long your battery should charge when it consumes x hours in my battery 8Ah = 0.
39A x 20, 5 hNow place your battery for 1 hour and connect it to any 12 v bulb voltage of the car hadlight or battery, I didn't have a lot of equipment and a lot of knowledge when I wrote this manual.
I have gained more experience in battery and electronics over the years, so I decided to test what I wrote 5 years ago.
I got two old batteries that my uncle used with portable speakers, both of which were dead (4.
5 V when the terminal is measured ).
I slowly charged them and tried to drain them.
The first battery is only 402 mAh (same as the one I charged init about 4y old), too low for the 7Ah battery and the second one has 4424 mAh which
I turned them on instead of the sulfuric acid I got from the old lead acid battery.
I used the pulse charger I made and the first battery didn't want to be more than 10 v, which is clearly a sign of the bad battery.
The second one is the charger for about 2 days and when I try to discharge I get 6682 mAh which is very good for 4y old SLA Battery.
The same pulse charger is used on the starter battery of the motorcycle (12 V 3Ah) and after several charge/discharge cycles, it is enough to start the engine and charge at the right speed.
I can't say the pulse charger (or grocery machine) works, but in my experience they did help me with both batteries and I didn't have any luck with the third one.
I also tried the simple 12 v transformer and the bridge rectifier, I was unlucky to live the first battery belt, it just got hot and the voltage went down further to 6 v, this is the most likely sign of damage to cells.
The Desulfator/pulse charger is a simple 555 timer with a 1 khz signal that can turn the mosfet on and off (1 MS on time) with a pulse length of about 18 v up to 10A
TL: The DR method shown in this instructable works fine, but your results will make a big difference.
You may be lucky to restore your battery or the battery may be damaged and cannot be repaired.
The pulse charger may work, but if your battery can't be fixed, just buy a new one (you can also get a discount by returning the old one when you buy the new one ).
The capacity will also vary, and some batteries may be close to the original capacity, but the capacity will be low if the board or electrolyte is not good.