battery starter

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Hi Guys
Just wondering if anyone knows of a little device that will start our two
batteries if they are flat , like mine was.
Some thing small and portable.
I have looked and the ones I have found seem to do a 12v batteries but not
two of them.
Would you need a 24v starter thing or a 12v able to connect to the two
batteries.
Just thought it would be handy to have .
cheers
john 92HDJ 80 1HDT
 
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Guest

Guest
Hi Guys
Just to add, what amps does it take to start one of our cruisers from cold.
Are these amps devided by the two batteries, IE if it takes 120 amps to
start is that the same as needing 60 amps from each battery.
Could I buy a 12v battery starter and connect it to the two batteries to
start it.
I ask because when my batteries were flat and a guy started them he used two
large batteries( much larger than what is in the cruiser) one connected to
each of my batteries..
Again im getting into something I know nothing about.
Could you connect the two cruiser bastteries to the one 12v sourse to start
it.
cheers
john 92HDJ 80 1HDT
 
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John,
You are right about the starting current being halved between the two
batteries because of the 24V system.
If only one battery were flat then a booster will work, the problem is if
both are flat the booster will only supply 12V and with a second flat
battery is not usually enough to start the engine, also the flat battery
will actually be a drain on the good battery or booster when you are
starting.
Never put a single 12V booster across both batteries on a 24V system, I
suppose two boosters would be ok, one on each battery but you would have to
be careful connecting up.
The battery in you car can release explosive gases and explode if not
connected correctly, I have sent you a html email with a photo of a battery
that exploded.
Some good practise notes from HSE
Every year a number of people are injured when batteries explode resulting
in acid burns to face, eyes and hands and other injuries
Charging of batteries gives off flammable hydrogen gas which can explode if
ignited
Always wear goggles or a visor when working on or in the immediate vicinity
of batteries
Whenever possible use in a well ventilated area
Remove any metallic items from hands, wrists and neck (rings, chains etc.)
before working on a battery
Disconnect the earthed terminal first
Always observe the manufacturers instructions for charging and maintenance
Make sure the battery is topped up to the correct level
When charging make sure the charger is switched off before connecting /
disconnecting the battery and never exceed the recommended charging rate
Malcolm Bagley
Stafford, UK
1975 FJ45 Pickup (In Work)
_______________________________
Just to add, what amps does it take to start one of our cruisers from cold.
Are these amps devided by the two batteries, IE if it takes 120 amps to
start is that the same as needing 60 amps from each battery.
Could I buy a 12v battery starter and connect it to the two batteries to
start it.
--
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Checked by AVG Free Edition.
Version: 7.1.405 / Virus Database: 268.12.4/449 - Release Date: 15/09/2006
 
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Guest

Guest
John,
Most of the time it will only be one battery that goes flat. This
happened to me on the way back from Iceland last year. One booster
pack will get you started in this case, as it did with me, every time
I needed to start on the way back, for most of the journey.
Regards, Clive.
 
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Guest

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John
| Hi Guys
| Just wondering if anyone knows of a little device that will
| start our two batteries if they are flat , like mine was.
| Some thing small and portable.
| I have looked and the ones I have found seem to do a 12v
| batteries but not two of them.
| Would you need a 24v starter thing or a 12v able to connect
| to the two batteries.
| Just thought it would be handy to have .
| cheers
| john 92HDJ 80 1HDT
Because the batteries are connected in parallel, except when you turn
the starter, one of those 12v boosters should do fine. Just connect it
up to either battery (doesn't matter which as it will charge both) for,
say, 10 minutes. Then, leaving it connected, start the truck.
The fact that the cruiser uses 24v, with the batteries in series, to
start the engine shouldn't be a problem as a few minutes of high-power
charging should get enough oomph into the batteries to start it.
Please DON'T buy a 24v booster charger and connect it across both
batteries!!
The other solution is to keep a spare battery on the bench,
trickle-charged by an ordinary charger. Then use this as the booster,
via jump leads, using exactly the same process. I do this when
visitors' cars won't start with the 12v "leisure" battery that I use for
the electric fence, and usually a couple of minutes connected together
is enough.
Christopher Bell
Devon, UK
1996 1HD-FT
____________________________________________________________
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Guest

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Hi Guys
Thanks for that info and as usual I am very gratefull for any understanding
of things you guys who already know can supply.
Ok so if one battery is flat and the other is ok, one charger/starter will
do.
If the two batteries are flat one charger/starter will not do.
Ok here I go again so bear with me.
If the charger/starter is 12v and will only do one battery why wont a 24v
connected to the two batteries do for the two.
I ask this because if im being told that a 12v starter/charger will do only
one 12v battery and not two batteries, does this mean the 12v is split into
two 6v and therefore not enough.
So if this is the case why wont a 24v split between the two batteries equal
to 12v each work.
Or has it to do with the actual amps produced by the starter/charger thing.
If I was to get a battery of 680 amps something like the cruisers batteries
I think would this be enough to start the two batteries if both were flat.
What does it take to start the cruiser in amps drain from the batteries and
is this divided equally from each battery.
cheers
john 92HDJ 80 1HDT
 
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John,
To cut a long story short:
1) Starter OFF - one double 12V battery
2) Starter ON - one single 24V battery (12V+12V)
When the batteries are in state 1) and one battery loses charge, it
will bring the other battery down because they are conected in
paralel. Therefore, according to the second law of thermodynamics,
which says that the differences between systems in contact with each
other tend to even out, you can't have one flat battery and the other
fully charged.
You can connect two or more paralleled baterries to a charger but the
charging current per battery will be reduced, hence it will take
longer to do the job. It also depends on the charger. I have a CTEK
Multi XS7000 which can charge battery banks without any probs.
--
Rgds,
Roman (London, UK)
'92 HDJ80
On 9/17/06, John Byrne <[Email address removed]> wrote:
 
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Guest

Guest
John,
Read Christophers post. One battery pack will charge up both of
your flat batteries enough to start the car, they are connected as 12v
normally.
Regards, Clive.
 
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