depends on car if we talk a up to mid 1990s car then 1 is definetly the correct answer .But it depends why the battery was flat? like if the battery has a internal short and you jumpstart it and drive it can damage things . if the battery was flat because the light was left on then nothing will happen and it will bring the battery back up to fully charged , sulfating the battery will occure however ona full discharge .
So the best option is a electronic professional charger to bring the battery back to full charge and automatic desulfate the battery with the charger. Special charger is rerquired for any new battery like calcium batterys.
bigfatmat1,
May 21, 3:30pm
charging systems are deigned on the ten hour rule. That's ten hours of driving to charge your battery. If its late model this will not include idle time. Also if the battery is of the calcium type then unless you driving on extremely rough terrain then it may only reach 80% of charge. Thus lower state of charge may not be noticed by the driver as more often than not everything will appear fine starting ect but at 80% charge the battery will still sulphate due to acid stratification. Shortening the life span the battery. The only way to overcome this is charge it with the correct charger for the battery type!
tamarillo,
May 21, 3:39pm
I tried the charge as it goes and really didn't get battery ok even after thousands of kilometres. Battery place said modern ones need proper charge and it did make a difference, and no charge.
kazbanz,
May 21, 4:24pm
Billy--my view is that it aint worth the risk. easier just to charge it up with a charger overnight. especially with winter coming
The diodes in the alternator can be blown by a jump start. So it may not charge right again. Happened in a family members terrano.
bigfatmat1,
May 22, 4:30am
Diodes will only blow when leads connected backwards. Also ctek charger way to small. The super cheap charger has no info so unsure.
therafter1,
May 22, 5:04am
I keep all my batteries charged with the ctek no problem at all, one of which is a 1000CCA optima red top in my tractor.
bigfatmat1,
May 22, 5:44am
the one you linked to is for motorcycle charger.charging upto 32ah. Thats pretty small battery. 10% of the ah is is quick easy rough calculation.
intrade,
May 22, 6:04am
i have a supersheep charger and a 25 amp ctek with supply voltage for diagnostic and stabalising the battery 0 ripple on the ctek but the zero ripple is only importatnt for programming and relearning modules like throttle bodys etc called a teach-in process most modern alternators also need teaching in as to size of battery with a oem capable scantool so that is another problem when the batt was fully flat the system lost its memmory of what the battery was to be charged, more of a issue on full disconnect i dont know how low a battery can discharge befor the volitail memmory is lost, thats is the tech name for it. probably spelled wrong but he whom cares about spelling probably all gibberish what i wrote to most of you.
intrade,
May 22, 6:07am
supercheap have a cheap calcium charger for about 80$ its manual select what battery type in a way i like that better because then you know it is using the programm for the battery you want . however you need to know what you have defaults to gel battery if i recall right just looked dont have the one i got any more online. i found the old one i had whom is in europe now for our dacia on tradme the thing is a small charger with 4 amp will charge a big battery but it will take a whole week as the amps is the amount of water= amparage drooling in to the battery, that is how it should work so under 4 amp is not avised my supercheap one is 8 amps .
intrade,
May 22, 6:27am
just looked closer it seems to be the new model of what i have you can see the mode button my one has the mode button on top. its a good charger charges anything but a bit on the high side price wise maybe get it on 25% off days.
billyfieldman,
May 22, 1:48pm
Thanks for all the help.
I just checked my battery says CCA 600, RC 110. Will the SCA charger above ( 12 Volt, 10Amp) be able to fully charge the battery from flat to full in 24 hours ?
intrade,
May 22, 1:56pm
cca is cranking amps the charger will tell you when it is finished . you can always reconnect it again at a later date. and yes that charger will be good enough i charge 1000cca batterys with that older style sca charger. the charger puts 10 amps per 1h in to the battery so in 24h its pumped 240 amps in to it. cranking amps are not capacity amps the capacity amps are always lower then cca
intrade,
May 22, 1:57pm
make sure to select the correct programm for your battery with the mode button.
daryl14,
May 22, 6:31pm
What you talkin bout Willis?
bigfatmat1,
May 22, 6:56pm
Replying to 3 posts at once. Diodes only blow when jump started backwards.
jason_247,
May 22, 7:33pm
yea the 10 amp charger will do it fine.
i thought the biggest issue is most batteries are designed for a full charge at 5-15 amps.
if you charge from dead flat on the alternator at 60-120amps you will likely boil away the electrolyte fluid and ruin the battery
bigfatmat1,
May 22, 7:36pm
Your alternator does not work like this it will only dump a large charge in untill voltage comes up which only takes a few mins then the charge rate will drop down to only a few amps.
yz490,
May 23, 4:53pm
If it's a good battery that's gone flat due to say--gone shopping & left the lights on--then it'll be back to normal [almost] by the time you get home. If at home just jump it & speed the idle up [if manual choke] & go & have a cuppa. If in doubt just point lights at the wall & anything above idle you'll see them come up & will be going hard out into a flat battery. 2000 rpm would do it. Turn light off of course--although would handle it. Just another idea to toss around or shoot down in flames lol. Just recalling a 'big' charger we had at work that you could crank up the amps with a low & high knob by memory. If you had an old battery that needed waking up i just used to 'crank it up' & watch the needle creep up & click it back & back till it settled [what's that smoke in the corner] damn it's crept right up again. [M'cycle shop 20 years ago] but sort of relevant as was a big [call it an] industrial charger that would charge anything pretty much. Cheers.
esky-tastic,
Jan 17, 1:46am
Never ever happened to me yet in 40+ years and dozens of flat batteries.
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