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#21
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The stuff I was building the chargers for didn't have the luxury of
getting the last gasp out of a battery - we had minimum backup life we had to guarentee. Most of mine would try a rescue then run a controlled discharge to measure capacity followed by a leakage run. It the controller reported failure of either one it notified a control center and a replacement was scheduled. After several years of messing with this stuff we wound up using very high current spikes followed by a cooling period for the initial recharge. The protocol varied with the battery, but it was something like 100 msec at 10x rated charge current using a 5% duty cycle. Fun stuff - got to spray batteries all over a test cell <g>. Made me very cautious around charging batteries. On Thu, 3 Mar 2005 18:03:18 UTC Rich Hampel > wrote: > But you cant equalize a gel battery ... or you blow out the pressure > valve. I simply turn them upside down and slow charge them back to > recovery. > > In article >, Will Honea > > wrote: > > > I have designed and built such chargers for industrial and > > instrumentation batteries - some the size of your Jeep - and there is > > a caveat to all these processes: success rate even in lead-acid (or > > Gel equivilants) designed for deep discharge is at best 75% for one > > day sitting dead. That goes down rapidly with each day it sits. > > After 4 days, getting even one back to a functional state is a > > surprise. Also look at the cost and what you have even if it does > > work. Sometimes it's cheaper and a lot more reliable to bite the > > bullet and get a new one if there is any doubt. > > > > On Wed, 2 Mar 2005 19:37:52 UTC Rich Hampel > > > wrote: > > > > > If you left the battery fully discharged for more than one or two days. > > > take the battery to an auto-electric speicalty shop and have them > > > 'equalize' it. When you ask to have it done and the counter man has a > > > strange look on his face, leave the shop. > > > > > > Equalization is controlled over-charging (at a precise voltage ... and > > > correlated to actual battery temperature) will help to desulphanate the > > > plates, Batteries that are left in a dead state for more than one to > > > two days will sulphanate which will lead to premature battery failure. > > > Equalization is done by applying a specific charge rate that causes the > > > battery to 'boil'. Obviously dont do this yourself as you may explode > > > the battery in the process, etc. > > > > > > A rapid fast full charge (turn the charger switch to 'manual' ), will > > > sometimes be good enough. Do this outside and with plenty of 'space' > > > so if the battery 'goes' noone gets hurt. Hook up charger, switch to > > > manual, follow looooooong extension cord to power source and plug in. > > > Dont even think of going near the battery when its fast manual charging > > > in case it goes booooooom. Charge for about an hour, turn off charger > > > and if battery is less than hot to touch, switch to automatic, etc. > > > > > > There are three stage solid state (expensive) external regulators that > > > allow for equalization ... but again if you dont know what you are > > > doing, you can get seriously hurt. > > > > > > In article >, nds > > > > wrote: > > > > > > > The battery may survive. Suggest setting battery charger to 6 volt setting > > > > and when charge rate drops below 2 amps set to 12 volts and continue to > > > > charge. > > > > > > > > "Greg" > wrote in message > > > > news:nBpUd.519892$8l.226545@pd7tw1no... > > > > > I park my CJ in one of those 10'x20' grey plastic garages, was out > > > > > wheeling last sunday, and obviously I forgot to turn off lights, battery > > > > so > > > > > dead not even a click, stuck camper battery in and on come lights. So > > > > > question is, had CJ for 1 1/2 years, battery of unknown age, one of > > > > > those > > > > > ones with green lights, ( no green there today ), is it worth trying to > > > > > charge it or is it shot? I've had dead batteries before, but not ones > > > > > that > > > > > dead, 7 days of headlights on, so I don't know if a non deap cycle battery > > > > > can come back from that. > > > > > > > > > > > > > > > > > > -- Will Honea |
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#22
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give me the date code from your bat & i will tell you how old it is or, take a look at this link & scroll down to question 4 http://www.autobatteries.com/faq/index.asp either way, out of curiosity, let us know the age warning: this does not work for all bats. it definitely works on johnson controls branded bats (more than a dozen brands, depending on where they are sold, so chances are good) but delco & possible others uses diffr scheme for their bats to see a list of johnson controls batteries follow this link http://www.autobatteries.com/brands/index.asp take out common vehicle mfr's out the door - what's left is johnson's own brands btw. in case you don't know www.autobatteries.com has been started & is maintained by johnson controls... "Greg" > wrote in message news:nBpUd.519892$8l.226545@pd7tw1no... | I park my CJ in one of those 10'x20' grey plastic garages, was out | wheeling last sunday, and obviously I forgot to turn off lights, battery so | dead not even a click, stuck camper battery in and on come lights. So | question is, had CJ for 1 1/2 years, battery of unknown age, one of those | ones with green lights, ( no green there today ), is it worth trying to | charge it or is it shot? I've had dead batteries before, but not ones that | dead, 7 days of headlights on, so I don't know if a non deap cycle battery | can come back from that. | | |
#23
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It might well come back, as long as it didn't freeze, but I think you'll find that it'll take a fairly serious charger to make it happen. When a battery sits dead for very long the plates change and become harder to put a charge into. Here's a link that explains it, to some degree.. http://www.flex.com/~kalepa/technotes.htm Read under the heading "Charge". Good luck, John nds wrote: > The battery may survive. Suggest setting battery charger to 6 volt setting > and when charge rate drops below 2 amps set to 12 volts and continue to > charge. > > "Greg" > wrote in message > news:nBpUd.519892$8l.226545@pd7tw1no... > >> I park my CJ in one of those 10'x20' grey plastic garages, was out >>wheeling last sunday, and obviously I forgot to turn off lights, battery > > so > >>dead not even a click, stuck camper battery in and on come lights. So >>question is, had CJ for 1 1/2 years, battery of unknown age, one of those >>ones with green lights, ( no green there today ), is it worth trying to >>charge it or is it shot? I've had dead batteries before, but not ones that >>dead, 7 days of headlights on, so I don't know if a non deap cycle battery >>can come back from that. >> >> > > > |
#24
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Rich,
Good post. Steve |
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