On 18/1/2023 2:35 pm, mike wrote:
Starters can draw 150 - 500 amps of 12 volt DC current. If the negative
leads aren't making a good connection, the car bumpers might make the
perfect substitute. In the days of metal bumpers, having them weld
themselves together is probably not the best outcome. With plastic
bumpers, not so much of an *electrical* issue but you'll be scuffing the paint on them.
Then they said positive first.
Why?
If you need to constantly add water, I suggest you check your charge
output. Your battery is being overcharged and is gassing the battery.
Doesn't do a lot for the longevity of the battery either.
And how do you know how much to add?
They say add water to the "splash plate" but what is that?
As long as the electrolyte covers the top of the cell plates, all will
be well.
They say the six chambers produce 2.1 volts each for 12.6 volts?
Isn't it more than that?
Nope. The electrical system of a car is *14 Volts*, not 12V as is
commonly believed. You need that voltage to charge a 12 Volt battery at
its nominal 12.6 Volts. After charging, the battery will show more than
that but it is only a *surface charge* and will quickly dissipate back
to 12.6. What people don't realise is that the battery is *only* for
starting the engine. Whilst ever the engine is running, the car
electrical system is running off the alternator - hence a 14 Volt
system. NB, alternators typically output between 13.8 and 14.2 Volts.
Any less and the battery may not fully charge, any more and you will get gassing.
They say adding water before charging will make it overflow.
Does it really change the water level that much from dead to charged?
Ask yourself what heating water does to its volume and you'll have
answered that question.
And what happens if you tap water instead of distilled?
On Friday, January 27, 2023 at 9:33:43 PM UTC-6, Xeno wrote:
On 18/1/2023 2:35 pm, mike wrote:
Starters can draw 150 - 500 amps of 12 volt DC current. If the negative
leads aren't making a good connection, the car bumpers might make the
perfect substitute. In the days of metal bumpers, having them weld
themselves together is probably not the best outcome. With plastic
bumpers, not so much of an *electrical* issue but you'll be scuffing the
paint on them.
Then they said positive first.
Why?
Although the thread is rather lengthy and has been virtually exhausted,
I am going to venture out an explanation here.
Prevents Sparking or Arcing if in the event wires did touch. More energy passes from the negative (anode) to the positive (cathode) side, due to
the way electrons flow, which create a potential for arcing on the positive side. So, you go to the "stronger" or more energetic side first, then you apply either the chassis or earth ground. It also puts less strain on the stator and rotor on the electric motor in your alternator.
Follow or look up this enclosed link below. It gives details on arcing here.
https://getjerry.com/questions/what-are-some-reasons-why-my-car-battery-sparks-when-connecting-the-charger
Your silly reference claims there is a spark because you left something
on (which on modern cars is always true) but ignores that you are
connecting a charge battery with an uncharged one.
Your silly reference claims there is a spark because you left something
on (which on modern cars is always true) but ignores that you are
connecting a charge battery with an uncharged one.
OK, so I missed that. Here's one that does address the dead battery you
would be connecting the vehicle to. My apologies for missing the dead
one that is not charged. Link is below:
https://blog.napacanada.com/en/how-to-safely-and-quickly-recharge-a-dead-car-battery/
There are similar articles to connecting batteries to capacitors (which is basically what a
battery essentially is), although we're dealing with DC circuits.
Good Luck.
Charles Lucas
On 1/30/2023 16:42, Carlos E.R. wrote:
On 2023-01-19 02:01, Rod Speed wrote:
On Thu, 19 Jan 2023 04:54:10 +1100, John Robertson <j...@flippers.com>
wrote:
After the engine starts, then disconnect the negative lead that is
AWAY FROM THE BATTERY so any spark created at the disconnect point is
unlikely to cause the battery to explode if hydrogen gas was created.
No, because the battery doesn't gas unless it is being charged when
fully charged already and that won't be happening with either battery.
The "bad" battery will start charging when connected, and there will beThe last time I had a really flat battery, and jumping it didn't work (perhaps the cables weren't heavy enough gauge), I started it with
no current limiting.
another battery installed (cables semi-tight pushed-on)... then with the alternator keeping it going, I disconnected that battery, and hooked up
the flat battery. You could instantly hear the engine bog down from the alternator kicking into high-gear. This was a 1960's car, BTW, with a
modern 12v battery. Perhaps this isn't the hottest idea with a new car
using expensive electronics, but it works fine on older rigs with a good alternator.
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