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Double Your Batteries! - Car Talk - Nairaland

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Double Your Batteries! by OShepherd: 6:43am On Sep 08, 2015
CAR GURUS in d house! Can any1 in d house shed more light on the effect of using "doubling" 2 supposedly weak 12V car batteries 2 start a re-built Engine since d AutoTech couldn't find a single 12V. Any effect on other components within d Car unit as I presumed!
Re: Double Your Batteries! by Denn(m): 7:03am On Sep 08, 2015
It is simply not good.

This is one of the bad practice's the mechanics passed on from working on old Peugeots. Then, those cars had no ECU or sensitive electronics and the worst that could happen then was a blown bulb or cheap Bosch coil.

Today, it is different. Any mechanic who does that will remove thermostat and sell your catalyst cells.
Re: Double Your Batteries! by mayor2013: 9:03am On Sep 08, 2015
You are ready to turn your car into a trailer which works on 24v. Its altight. Dont come here crying that your Ecu was fried up. As for that your mechanic. He needs to be flogged seriously angry

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Re: Double Your Batteries! by Nobody: 9:09pm On Sep 08, 2015
If the batteries are connected properly (in parallel), there should be no problem.
You are effectively doubling the power 'seen' by the load from the batteries while maintaining the same voltage, usually 12 v.
I wouldn't recommend doing this on modern vehicles with very sensitive electronics for long periods though.

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Re: Double Your Batteries! by Nobody: 5:39am On Sep 09, 2015
0rex:
If the batteries are connected properly (in parallel), there should be no problem.
You are effectively doubling the power 'seen' by the load from the batteries while maintaining the same voltage, usually 12 v.
I wouldn't recommend doing this on modern vehicles with very sensitive electronics though.
if he doubles the battery in parallel, would that not increase the current being supplied to the ECU. Modern day devices have circuit ratings, he would effectively fry the ic's and other sensitive electronic components on his ECU. other electrical equipments like stereo, wipers, seat heaters, window heaters e.t.c would also be at risk of getting toasted. It could also damage the alternator.
Re: Double Your Batteries! by peterjero(m): 7:37am On Sep 09, 2015
So you guys are saying a car can't be jump started if yes is that not 24v, I do that everyday for peeps I see on the road, compound, work etc.... Say what you know. Because he said doubling, you guys couldn't decipher what jump-start is.
Re: Double Your Batteries! by Nobody: 8:09am On Sep 09, 2015
saxywale:

if he doubles the battery in parallel, would that not increase the current being supplied to the ECU. Modern day devices have circuit ratings, he would effectively fry the ic's and other sensitive electronic components on his ECU. other electrical equipments like stereo, wipers, seat heaters, window heaters e.t.c would also be at risk of getting toasted. It could also damage the alternator.
Yes. That is why I said I won't recommend it. Remember the OP said 'two weak batteries'.
I know theoretically, the loads are supposed to draw only the current needed from the current available from the batteries but practically, other components especially the alternator might be at risk because of overloading. I wouldn't expect even someone using older model cars using this parallel arrangement more than a few seconds just to start the car.
Remember that this is effectively what you do when you 'jump-start' your car; you are parallelling two batteries.

Good morning.
Re: Double Your Batteries! by Nobody: 8:12am On Sep 09, 2015
peterjero:
So you guys are saying a car can't be jump started if yes is that not 24v, I do that everyday for peeps I see on the road, compound, work etc.... Say what you know. Because he said doubling, you guys couldn't decipher what jump-start is.

Batteries can be doubled in two ways. One is harmless, the other can be disastrous. That's just the summary.

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Re: Double Your Batteries! by mayor2013: 10:41am On Sep 09, 2015
0rex:


Batteries can be doubled in two ways. One is harmless, the other can be disastrous. That's just the summary.

Which ever way you double it, be prepared to face the music when its being played
Re: Double Your Batteries! by peterjero(m): 12:33pm On Sep 09, 2015
Please peeps read his question very well, he said start a car because he couldn't get a good battery. I wonder all these ITK wey full nairaland. I jump-start cars and trucks on weekly basis, is that not doubling. He used the word "START" argh wetin sef una still dey defend una ignorance.
Re: Double Your Batteries! by Nobody: 5:26pm On Sep 09, 2015
mayor2013:

Which ever way you double it, be prepared to face the music when its being played
So you are saying modern vehicles can't be jump started?
Re: Double Your Batteries! by Nobody: 5:38pm On Sep 09, 2015
peterjero:
Please peeps read his question very well, he said start a car because he couldn't get a good battery. I wonder all these ITK wey full nairaland. I jump-start cars and trucks on weekly basis, is that not doubling. He used the word "START" argh wetin sef una still dey defend una ignorance.

Ignorance is seeing "jump starting" as 24V. Do you connect the slave battery to the car being boosted in series? Because that will effectively give a voltage the sum of both.

Automotive batteries are boosted in parallel. Even if 3 batteries are connected in parallel, the resultant voltage remains 12 (assuming the 3 batteries are 12V).

If you don't understand something, you ask questions.

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Re: Double Your Batteries! by Coldplay007(f): 6:13pm On Sep 09, 2015
Siena:


Ignorance is seeing "jump starting" as 24V. Do you connect the slave battery to the car being boosted in series? Because that will effectively give a voltage the sum of both.

Automotive batteries are boosted in parallel. Even if 3 batteries are connected in parallel, the resultant voltage remains 12 (assuming the 3 batteries are 12V).

If you don't understand something, you ask questions.
Well! OP said doubling without explaining whether it's in parallel or series. But he then said "24V" which shows he didn't understand the concept..
I'm sure the mechanic connected the batteries in parallel which is the same as jump starting a car. So what OP saw is not as incredulous as he assumed..
Re: Double Your Batteries! by Denn(m): 10:28pm On Sep 09, 2015
OShepherd:
CAR GURUS in d house! Can any1 in d house shed more light on the effect of using "doubling" 2 supposedly weak 12V car batteries 2 start a re-built Engine since d AutoTech couldn't find a single 12V. Any effect on other components within d Car unit as I presumed!

The keyword is 'weak'.

The op wants to know if you can use two discharged batteries connected in series or parallel (not stated) to start a car.
Re: Double Your Batteries! by adanny01(m): 12:08am On Sep 10, 2015
OShepherd:
CAR GURUS in d house! Can any1 in d house shed more light on the effect of using "doubling" 2 supposedly weak 12V car batteries 2 start a re-built Engine since d AutoTech couldn't find a single 12V. Any effect on other components within d Car unit as I presumed!

You can double, triple, quadriple and so on but as long as they are connected in parrallel. In series will be disastrous for a 12V car but 2 in series is required for 24V car.

Note: I would advise to disconnect all slave batteries immediately after the car starts. Thats because the charging system would have been overloaded by the presence of extra batteries. I dont know precisely a serious effect of leaving them connected but can imagine it will be bad after some time as the charging current from the alternator passes to all the batteries which is almost certainly beyond its capacity.
Re: Double Your Batteries! by lonelydora: 12:56am On Sep 10, 2015
Which car do you intend to start with the 2 batteries?


Op, if properly connected in parallel, i don't THINK there should be any problem if it is just for starting the car. But, it MAY affect your ECU if not properly done.

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