Changed my car a couple of weeks back and it has the push button
start/stop rather than ignition key. It also cuts out if stopped at
traffic lights and restarts when accelerator pedal is pressed.
All very well for saving fuel and I am sure the answer will be yes, but
how much does this impact on the battery life with all the `extra`stop
starts, or has the technology improved so that this has no adverse
effect on battery life.
Most of our driving is around town.
There's also a new 'breed' of batteries becoming available
specifically designed to handle this, I think they're actually called
'stop/start' batteries. Yes, a quick search for 'stop start battery'
brings up loads of hits.
Batteries for the automatic stop/start system are designed for that
My car has that system, but also has a button which disables it
temporarily (pressing it again resets it). I find it helpful to disable
it at junctions which are on a slope and you need to keep the brake on
to avoid rolling forwards or back, and/or are very busy and when a gap
appears you need to nip out quickly.
We had a Polo with this many years back when it was a very new thing. I
don't think I ever replaced the battery in a good number of years.
Not a problem with Jazz Hybrid, that starts of the "main" battery and
motor/generator, although there is a small lead acid and conventional
starter for backup.
They use the normal pinion starter when the engine is cold, and use the
alternator to start it via the belt once it's warmed up (oil less viscous)
Mine did have to have a new belt tensioner at under 2 years old.
On Monday, 23 March 2020 19:36:40 UTC, Andy Burns wrote:
What's the point of that?
If it's easier for the alternator, it'll be easier for the starter motor too.
I had a courtesy car with that feature, it made a similar noise on automatic start to initial start. But I suppose there are various ideas about.
Remember the amount of amps required to restart a hot engine (especially
one tuned for stop start) is tiny compared to a cold start on a winter's
day. And the batteries tend to have a larger capacity than a similar car
*Why don't sheep shrink when it rains?
Dave Plowman email@example.com London SW
Plus when the engine is stopped, the ECU ensures it stops in an ideal
position to require minimal rotation to restart.
Unless you do a lot of start/start heavy traffic driving the fuel saving
It was only brought in by car manufacturers to artificially reduce CO2
emiisions to comply with EU regs.
Absolutely no effect at all. The engine leaves itself primed ready to
fire and will restart again before you can even put it into gear. If the
engine isn't warm enough to support fuel saving mode it will display an
icon on the dash instead and keep running. If the engine block cools to
a point where restart might be a problem it spontaneously restarts -
which can be a little disconcerting the first time it happens to you.
Failure to use the car regularly and/or only ever doing very short
journeys can be more of a problem for the battery life.
The main problem with modern electronic ignitions is that if the battery
is borderline the immobiliser can panic when the starter motor current
draw causes the battery voltage to collapse. I had that happen to me
last month and was walking home when a friend stopped picked me up and
we went with jump leads. But my solar panel recharger had actually put
just enough into the battery in the couple of hours I had been walking
to allow it to start so I should have just sat with it and waited.
My four year old Skoda Octavia with stop/start feature recently told me its
battery was getting flat and a test at a specialist revealed it was indeed
nearly dead. A new one was £90 which didn't seem TOO bad to me. They
said batteries have an expected life of about 4 years.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.