A good friend of mine has just been awarded the UK dealership for these Cos I wanted it !!!
Anyway this is some of the literature, I dont know if it really works, but who knows, only time will tell.
As Follows:
1. What are sulfated batteries?
According to studies by the “Battery Council Internationalâ€Â
Extend the life of your PB or NiCAD Batteries
-
- Posts: 182
- Joined: Mon Jul 16, 2007 8:22 am
- Location: Lightwater Surrey
Theres been loads of claims and counter claims of vairous types of de-sulphators etc , I tried EDTA (think thats what it was called) like a powder that your mixed into distilled water and added to a duff battery to de-sulphate.
Used tons of the stuff on my Bedford CF batts that had been laid up in a field for 4 or so years.
Results where ............. about what I suspected, some batts recovered some didnt (CPM tubulars) to this day I dont know if just a very long slow charge would have cured them the same or if the EDTA actually did anything ???
Reading round the web a lot of these types of things seem to get mixed results, are you planing on testing any as I would be interested in your findings
ChrisB
Used tons of the stuff on my Bedford CF batts that had been laid up in a field for 4 or so years.
Results where ............. about what I suspected, some batts recovered some didnt (CPM tubulars) to this day I dont know if just a very long slow charge would have cured them the same or if the EDTA actually did anything ???
Reading round the web a lot of these types of things seem to get mixed results, are you planing on testing any as I would be interested in your findings
ChrisB
Last edited by ChrisB on Thu Apr 03, 2008 12:21 pm, edited 1 time in total.
I reject reality and substitute my own !!!!!!
- MaryRCrumpton
- Site Staff
- Posts: 640
- Joined: Sun Dec 09, 2007 2:07 am
- Location: Chorlton-cum-Hardy, Greater Manchester
- Contact:
- Teslas fag packet
- Posts: 153
- Joined: Thu Aug 16, 2007 7:35 pm
- Location: Leeds
- Contact:
<SMUG>
Some time ago i designed a charger for the mini that uses ultrasonic pulses to charge the lead acid battery's, the ultrasonic pules are a PWM using the CI CV and float charge scheme. But the secret is to use a VERY fast discharge pulse after the charge pulse to shake the plates.
This effectively turns the battery into its own ultrasonic cleaning bath. Have recovered battery's with this and it works very well
</SMUG>
Some time ago i designed a charger for the mini that uses ultrasonic pulses to charge the lead acid battery's, the ultrasonic pules are a PWM using the CI CV and float charge scheme. But the secret is to use a VERY fast discharge pulse after the charge pulse to shake the plates.
This effectively turns the battery into its own ultrasonic cleaning bath. Have recovered battery's with this and it works very well
</SMUG>
- MaryRCrumpton
- Site Staff
- Posts: 640
- Joined: Sun Dec 09, 2007 2:07 am
- Location: Chorlton-cum-Hardy, Greater Manchester
- Contact:
Tesla's fag packet wrote:<SMUG>
Some time ago i designed a charger for the mini that uses ultrasonic pulses to charge the lead acid battery's, the ultrasonic pules are a PWM using the CI CV and float charge scheme. But the secret is to use a VERY fast discharge pulse after the charge pulse to shake the plates.
This effectively turns the battery into its own ultrasonic cleaning bath. Have recovered battery's with this and it works very well
</SMUG>
Ultrasonics ..... Hmmm now if this was dated 1st April..........
I kinda did it much more simply myself with a varied random charge and discharge cycling over a few weeks. It worked and very quietly too
battery rescue
http://www.marine-electronics.net/techarticle/battery_faq/b_faq.htm#12 gives a very detailed coverage of lead acid battery sulfation and rescue, without trying to sell anybody anything. Worth looking at.
Peter Ph
Theres loads of articles on electronic gadgets that you can hook up to batteries or washing out of cells or adding dopes to cells etc etc but I've always found just a long slow charge seems to work just as well on a battery that is able to be recovered.
The thing is you can have two types of sulphated liquid PB batteries, a new battery that has just been left in an uncharged state and an old battery which has been left in an un-charged state. Also how long the battery has been left in this state and the type of battery i.e flat plate
Lets take the new battery, generally I've found that a long slow charge will recover them to a reasonable level and sometimes back to pretty much normal. If the battery wont actually accept a charge then I've found dropping a bit of electrolyte from a fully charged battery is enough to get things moving without the voltage going over the top. While the sulphate causes quite a bit of expansion a new battery I've found they can cope with this sort of abuse.
An old battery though is generally a different ball game alltogther, for starters its plates will be a lot more fradgile and suffer hugely from the expansion due to the sulphate crystals this can cause them to crack and fracture particularly near the tops of the cells, if this has happened then without actually stripping a battery apart you have no chance of ever recovering the cells/battery, I've recovered batteries like this and they appear to be fine showing healthy spec. gravity readings and good voltages, everything seems fine except when you go to load them up and then it all goes pear shaped they are still fine for low levels of discharge and they work fine for that but you just cant pull any high levels of current off them any more.
Also you've got the issue with older batteries of sediment build up in the bottom of the cell causing more issues.
Active material loss off the plates which again causes further issues.
I think because there are so many ways a PB battery can fail this is why you see so many different views on these vairouse recovery ideas and gadgets and why some appear to work and some dont.
The only way would be to carry out some very carefully recorded tests on some very carefully chosen test subjects that are very much in a known condition, but this would take lots of time and considerable resources I would think.
ChrisB
The thing is you can have two types of sulphated liquid PB batteries, a new battery that has just been left in an uncharged state and an old battery which has been left in an un-charged state. Also how long the battery has been left in this state and the type of battery i.e flat plate
Lets take the new battery, generally I've found that a long slow charge will recover them to a reasonable level and sometimes back to pretty much normal. If the battery wont actually accept a charge then I've found dropping a bit of electrolyte from a fully charged battery is enough to get things moving without the voltage going over the top. While the sulphate causes quite a bit of expansion a new battery I've found they can cope with this sort of abuse.
An old battery though is generally a different ball game alltogther, for starters its plates will be a lot more fradgile and suffer hugely from the expansion due to the sulphate crystals this can cause them to crack and fracture particularly near the tops of the cells, if this has happened then without actually stripping a battery apart you have no chance of ever recovering the cells/battery, I've recovered batteries like this and they appear to be fine showing healthy spec. gravity readings and good voltages, everything seems fine except when you go to load them up and then it all goes pear shaped they are still fine for low levels of discharge and they work fine for that but you just cant pull any high levels of current off them any more.
Also you've got the issue with older batteries of sediment build up in the bottom of the cell causing more issues.
Active material loss off the plates which again causes further issues.
I think because there are so many ways a PB battery can fail this is why you see so many different views on these vairouse recovery ideas and gadgets and why some appear to work and some dont.
The only way would be to carry out some very carefully recorded tests on some very carefully chosen test subjects that are very much in a known condition, but this would take lots of time and considerable resources I would think.
ChrisB
I reject reality and substitute my own !!!!!!
Return to “All things battery related”
Who is online
Users browsing this forum: No registered users and 19 guests