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Car Forum / Australian Car Forums / General Car Topics (Australian group) / May 2004charging a car battery from flat how long?
g'day, any one know how long to put a dead flat average car battery on charge for? i usually put it on overnite, is that ok, would it hurt for any longer? thanks milo __- > g'day, any one know how long to put a dead flat average car battery > on charge for? [quoted text clipped - 5 lines] > milo > __- overnight should be fine, it only needs enough juice to start the car the first time, after that the altenator will charge it up to full in about a minute lol  SignatureDalienX Not sure where you get your info 'DalienX', but Ive never seen a battery thats capable of being charged to full capasity in one minute. It all depends on what the charge rate of your charger is and what size of battery your chargeing. If its a smallish car battery (for a small Jappa car) the overnight chareg of around 1-5 amps will do. A battery , especially an older one will never fully recover from a complete flattening unless its a deepcycle type (If youe asking the question Id say your isnt) battery. have a look to see if theres a date manufactured on yoru batter Milo and if its older than 2 years chuck it out and buy yourself a whole lot of less hassles and geta new one. Belive me for $100 its well worth it. Hope that helps Happy Motoring > > g'day, any one know how long to put a dead flat average car battery > > on charge for? [quoted text clipped - 9 lines] > the first time, after that the altenator will charge it up to full in > about a minute lol > Not sure where you get your info 'DalienX', but Ive never seen a > battery thats capable of being charged to full capasity in one > minute. Did you read what i said? cause it doesnt sound like it, i said charge the batter OVER NIGHT, then the altenator will charge it in about a minute (if the car starts that is), an altenator putting out about 50amps will charge a battery in no time SignatureDalienX >>Not sure where you get your info 'DalienX', but Ive never seen a >>battery thats capable of being charged to full capasity in one >>minute. > Did you read what i said? You trimmed it out. Let's put it back: >>>overnight should be fine, it only needs enough juice to start the car >>>the first time, > cause it doesnt sound like it, i said > charge the batter OVER NIGHT, Yes, got that bit, no problem there. >>>after that the altenator will charge it up to full in >>>about a minute lol > then the altenator will charge it in > about a minute (if the car starts that is), an altenator putting out > about 50amps will charge a battery in no time There it is again. A 50Amp alternator is not going to charge a 50AmpHour battery significantly in a minute. > Did you read what i said? cause it doesnt sound like it, i said > charge the batter OVER NIGHT, then the altenator will charge it in > about a minute (if the car starts that is), an altenator putting out > about 50amps will charge a battery in no time Pedantics, but it's longer than that: I had a digital ammeter on my deisel hilux, and could tell with some certainty that it takes about 5-10 minutes for the alternator to put back what the engine starting procedure takes out. (depends mainly on ambient temperature, and how long since you last run the vehicle). From a flat battery, a typical el-cheapo 4 amp battery charger should give enough juice over an hour to crank an engine, but forget it if it's an older engine that needs extended cranking. On a side note, be warned that it is NOT wise to leave lead-acid batteries discharged for long periods of time. They are better suited to being kept fully charged over their lives. SignatureLinux Registered User # 302622 <http://counter.li.org> > > Did you read what i said? cause it doesnt sound like it, i said > > charge the batter OVER NIGHT, then the altenator will charge it in [quoted text clipped - 7 lines] > the engine starting procedure takes out. (depends mainly on ambient > temperature, and how long since you last run the vehicle). Your diesel Hilux starts easier than my brothers 82 "Doglux" cold takes 2 minutes of glow/cranking, and so with a trip time of 10 minutes to work, it's no wonder the battery was too flat to start by Saturday :-) If it wasn't so cheap on fuel, and my brother's on a trawler and asked me to keep it running, I'd drive the Patrol. Took me 2 hours, some wiring repairs, a fuel filter and new battery to get it to run. "milo" <mrmiloman2003@yahoo.co.uk> wrote in news:40b82123$1 @news.comindico.com.au: > g'day, any one know how long to put a dead flat average car battery on > charge for? > i usually put it on overnite, is that ok, would it hurt for any longer? > > thanks Milo, you can buy a charge control unit, to put inbetween your charger and the leads to the battery, that will automatically cut out when the battery is fully charged. I think I paid $30 for it. Better safe than sorry with an 8 amp charger. Ron >g'day, any one know how long to put a dead flat average car battery on >charge for? The scientific way is to divide the battery capacity (Ampere hours / Amp Hr / AH) into the charger output to get the minimum number of hours (assuming the battery's in good nick). The catch times two being that many battery manufacturers no longer state the capacity (you'll usually find it in the car's instruction book however) and the charger manufacturers usually exaggerate their output. The conventional way is to remove the filler caps and cease charging as soon as the electrolyte starts to bubble. The safe easy way is to use a regulated charger, which will reduce to a trickle once the battery is fully charged. >i usually put it on overnite, is that ok, would it hurt for any longer? If you overcharge it you may generate hydrogen and oxygen inside the cells. If there happens to be a bad internal connection the mixture will go bang; the casing will burst and everything within an extensive radius will be drenched in highly corrosive sulphuric acid. Very messy indeed. -- John H Hotmail is a spam trap, wbuauneirl@ovtcbaq.pbz will reach me if you apply ROT13. Hi Milo, The answer is it depends on the type and current output of the charger you are using. Please see Section 9 in the Car and Deep Cycle Battery FAQ on www.batteryfaq.org. If you have a 50 Ah battery, you will need to put approximately 60 AH back into it to full charge it. With a 10 amp charger, it will take five hours to replace approximately 80% of the capacity. If you are using a constarnt voltage (regulated) charger, then it will take about the same amount of time to full charge it. Kindest regards, BiLL...... >g'day, any one know how long to put a dead flat average car battery on >charge for? [quoted text clipped - 4 lines] >milo >__- >g'day, any one know how long to put a dead flat average car battery on >charge for? >i usually put it on overnite, is that ok, would it hurt for any longer? > >thanks Here we go again. Q: How many amps are you charging into the battery Q: How many amp hour is the battery Q: How efficient is an automotive lead acid battery being charged Q: How *flat* is your battery Q: How come you live all alone in a Milo tin A: ignore the above and buy a hydrometer and learn how to use it. Also a voltmeter is helpful. In addition you could do like me and build yourself a voltage regulated charger 10 years ago :-) Al 2004 insult page awaits your contribution http://kwakakid.cjb.net/insult.html > g'day, any one know how long to put a dead flat average car battery on > charge for? [quoted text clipped - 3 lines] > > milo If the casing starts to bulge it's overdone. Milo! Just go out and buy a new battery and be done with it, if you had to ask the simple question you obviously have no extrensive experience like 'so many' NG subcribers here. For the sake of a few dollars save yourself a whole heap of greif and hop down to repco and get a new one. No need to worry about charge rates or testing, readings or explosions. New ones rarely clap out. PS Why did it go flat in the first place? >Milo! Just go out and buy a new battery and be done with it, if you had to >ask the simple question you obviously have no extrensive experience like 'so >many' NG subcribers here. Nah. I agree with Pat. :)) -- John H Hotmail is a spam trap, wbuauneirl@ovtcbaq.pbz will reach me if you apply ROT13. > Milo! Just go out and buy a new battery and be done with it, if you had to > ask the simple question you obviously have no extrensive experience like 'so [quoted text clipped - 7 lines] > > PS Why did it go flat in the first place? But you would suggest buying a new one every time it went flat regardless of whether it was just because he left his lights on or left the car sit for a year? >Milo! Just go out and buy a new battery and be done with it, if you had to >ask the simple question you obviously have no extrensive experience like 'so [quoted text clipped - 7 lines] > >PS Why did it go flat in the first place? I think he had a fair question. There is a lot more to batteries than you may think. Hmm, why did it go flat, maybe he ran over it. If not it and after charging it reaches it's full capacity, well he has saved a few bucks. Al 2004 insult page awaits your contribution http://kwakakid.cjb.net/insult.html |
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