Does new battery affect car performance?

[Mllcg]

battery powers electronics

 

alternater charges battery?

[Detach8]

i'm wondering how many of you are electronics engineer... verify what i am saying here:

 

alternator charges the battery

battery powers the electronics

battery also acts as a stabilizer to the alternator's output (like a capacitor)

an old battery will have higher internal resistance

with a new battery, less charging energy required the alternator also has slightly requires less effort to turn. (i can't remember how to explain this... i'm getting old... and i'm now a computer enegineer. but if you know your physics, you know what i am saying. imagine you turning a dynamo with no load connected. all the energy losses are effectively friction. once you hook up a load, it will need more energy to turn. the easiest description of this is the law of conservation of energy, but there's a proper name for that reverse effect of electromagnetism.)

fyi some newer cars do have electromagnetic clutch to disengage the alternator to improve power and fuel economy during acceleration

 

try taking the battery out while the car is running... i think the mechanic will say you are siao

 

anyway, no idea why it would make the car more powerful. as some bro suggested it may be true that the ECU got reset to factory defaults when the old battery was removed and it has learned the new fuel and air readings. recently always rain, air abit more dense and cold.

 

quote from wikipedia

 

"A discharged battery draws a high charge current of typically 20 to 40 A (Ampere). As the battery gets charged the charge current typically decreases to 2—5 A. A high load results when multiple high-power systems such as ignition, radiator fan, heater blowers, lights and entertainment system are running. In this case, the battery voltage will begin to decrease unless the engine is running at a higher rpm and the alternator/generator is delivering at least enough current to power the load."

 

http://en.wikipedia.org/wiki/Automotive_battery

Edited November 28, 2011 by Detach8

[Detach8]

and something new i found out also.. alternators require a power source first to work. it does not have a permanent magnet like a bicycle dynamo.

[Tigershark1976]

Starlet n datsun isnt control by ECU as in olden days there arent electronic contraled engines technology, cars back than are easier to troubleshoot and repair. The ICE and other accessories use it when you on it... ECU in another hand is on when the battery is connected when you are or not in the car.

 

 

but Starlet n datsun does hv other electrical component like lighting, wiper & etc rite? [laugh]

[Bystander50]

i'm wondering how many of you are electronics engineer... verify what i am saying here:

 

alternator charges the battery

battery powers the electronics

battery also acts as a stabilizer to the alternator's output (like a capacitor)

an old battery will have higher internal resistance

with a new battery, less charging energy required the alternator also has slightly requires less effort to turn. (i can't remember how to explain this... i'm getting old... and i'm now a computer enegineer. but if you know your physics, you know what i am saying. imagine you turning a dynamo with no load connected. all the energy losses are effectively friction. once you hook up a load, it will need more energy to turn. the easiest description of this is the law of conservation of energy, but there's a proper name for that reverse effect of electromagnetism.)

fyi some newer cars do have electromagnetic clutch to disengage the alternator to improve power and fuel economy during acceleration

 

try taking the battery out while the car is running... i think the mechanic will say you are siao

 

anyway, no idea why it would make the car more powerful. as some bro suggested it may be true that the ECU got reset to factory defaults when the old battery was removed and it has learned the new fuel and air readings. recently always rain, air abit more dense and cold.

 

quote from wikipedia

 

"A discharged battery draws a high charge current of typically 20 to 40 A (Ampere). As the battery gets charged the charge current typically decreases to 2

[Dumb]

My car battery was damaged/burnt and disabled and I started the car with help of another battery from AA mechanic. Drove all the way from my office car at Sophia Road to my car agent in Tuas in Jurong in heavy rain without battery. Does that mean my ecu etc died without battery?

[Bystander50]

My car battery was damaged/burnt and disabled and I started the car with help of another battery from AA mechanic. Drove all the way from my office car at Sophia Road to my car agent in Tuas in Jurong in heavy rain without battery. Does that mean my ecu etc died without battery?

 

Once your car starts, the alternator takes over in powering all the electronics and starts charging your battery.

The battery is used to start the car and power all the auxillary devices like clock, cabin lights, alarm, headlights (if you turn them on) when the engine is off.

 

Sometimes, there is a possibility that your ECU is not even reset when your battery is dead and can't start the engine. It is just that there ain't sufficient voltage to turn the starter motor, but the voltage is still sufficient to keep your ECU memory.

 

 

[Boo_saa]

The rest use petrol?

[Solar]

is that a light-weight battery??

 

[AlvinDj]

Yeah. I had a similar experience, having a dead battery one late night in Johor. Got help to jump start, then drive all the back to Singapore.

Wa... Johor the WORST place to encounter a dead battery... Esp at night or during the wee hours...

 

You'll be a robber's magnet...

[Cymagnus]

Was told by a mechanic that most ECU circultry do have a small backup battery which is not of recharable type. Sort of like the cmos battery on PC motherboards.

[Escksu]

not only ICE, all electrical components in the car draws power from battery. not directly from alternator. battery act as a storage media for the electricity generated from alternator....

 

Not exactly. Both the battery and alternator provides power to everything in the car. The +ve of the alternator is connected to the +ve of the battery as well.

 

However, its mostly from the alternator rather than battery. This is because the alternator provides a higher voltage ~14.2V compared to battery's ~12.6V

 

 

[Jchoo]

hey guys. I went to change my battery recently too. what does ICE and ECU mean?

[Dumb]

Not exactly. Both the battery and alternator provides power to everything in the car. The +ve of the alternator is connected to the +ve of the battery as well.

 

However, its mostly from the alternator rather than battery. This is because the alternator provides a higher voltage ~14.2V compared to battery's ~12.6V

 

Battery not needed and can be taken out once car started and moves. What you need is petrol for everything.

[Escksu]

Battery not needed and can be taken out once car started and moves. What you need is petrol for everything.

 

Yes, batt is not needed after car starts. My terminals every drop out before when car is running. No problem.... Only thing turn off key and then car cannot start.

 

 

 

 

[Escksu]

My car battery was damaged/burnt and disabled and I started the car with help of another battery from AA mechanic. Drove all the way from my office car at Sophia Road to my car agent in Tuas in Jurong in heavy rain without battery. Does that mean my ecu etc died without battery?

 

Nope. It only means your ECU's violatile memory was erased and you reset the ECU back to factory defaults.

 

Battery is only needed to start the car, after that as long as engine is running, alternator will be able to provide power to everything (may be insufficient for aftermarket ICE depending on alternator rating and engine RPM).

[Detach8]

AFAIK if you remove the battery and rely purely on the alternator you are putting strain on the alternator and also introducing your car electronics to voltage/current fluctuations. The battery is supposed to assist to smooth these fluctuations out. Sure you can drive, but if you drive prolonged w/o a battery you're likely to damage your electronics.

[Detach8]

hey guys. I went to change my battery recently too. what does ICE and ECU mean?

 

ICE = in car entertainment (radio, speakers, etc.)

ECU = electronic control unit (for your engine)