Short Trips and Flat Batteries in Adelaide

This guide is for Adelaide drivers whose car mostly does short hops around the suburbs and who keep getting caught with a flat or weak battery. It explains why short trips are hard on a battery, which cars are most affected, and practical ways to keep the battery healthy without changing how you live.

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A city of short drives

Adelaide is easy to get around. For many households, most trips are a few kilometres: the school run in Modbury, a quick drive to Marion for shopping, popping down to Jetty Road in Glenelg, or a short commute from Kent Town into the city. Plenty of people now work from home some days and barely use the car midweek.

That's convenient for you, but it can be hard on your battery. A car that only ever does short trips can slowly run its battery down, week after week, until one morning it won't start.

Why short trips drain the battery

Starting the engine is the biggest single load your battery handles. The starter motor draws a large current for a few seconds, and the battery has to make that energy back from the alternator once the engine is running.

On a short drive, the alternator doesn't have long to put that charge back, and it is also busy running everything else that's switched on. Headlights, the heater or air conditioning fan, the rear demister, heated seats, the infotainment system and a phone on charge all take a share. If the drive ends before the battery has recovered, you start the next trip with a little less charge than the last.

Over weeks, that small deficit adds up. A battery that is regularly left partly charged also tends to age faster, because lead-acid batteries don't like sitting below full charge.

Smart alternators and stop-start make it trickier

Many newer cars use a smart alternator that reduces its charging when the car's computer decides the battery has enough. This saves a little fuel, but on a car that only does short trips it can mean the battery seldom gets fully topped up. Our explainer on what a smart alternator is goes into more detail.

Stop-start systems switch the engine off at traffic lights, which is common on busy Adelaide roads like Greenhill Road or Glen Osmond Road. Every restart draws on the battery. These cars usually have an AGM or EFB battery built to cope, but they still need enough driving time to recharge. Most stop-start systems disable themselves when the battery is low, so if your stop-start has quietly stopped working, a weak battery is a common reason.

If your car has stop-start, replace the battery with the same type the manufacturer fitted. Our guide to car battery types explains why.

Cars that sit as well as do short trips

Every modern car draws a small current while parked to keep its computers, alarm and keyless entry ready. That's normal, but it means a car that sits for a week between short drives starts each trip with less charge again. Accessories add to it. A dashcam in parking mode, a GPS tracker or a phone cable left plugged into an always-on socket can tip a marginal battery over the edge.

If your battery goes flat after sitting for only a few days, there may be a fault drawing too much current. Our guide on why a car battery keeps going flat explains how an auto electrician tracks down a parasitic drain.

Signs your battery is losing the battle

Catch a struggling battery early and you can often save it with a good charge. Watch for:

• The engine cranking more slowly than usual, especially on cold winter mornings.
• Stop-start no longer working.
• Dim interior lights or a flicker on the dash when you start the car.
• Clock or radio presets resetting.
• Battery or charging warnings on the dash.
• Needing a jump start more than once.

Simple ways to keep your battery charged

You don't need to drive more for the sake of it, but combining errands into one longer trip helps. Once a week or so, try to give the car a longer run at steady speed. A run down the Southern Expressway, up the South Eastern Freeway into the Adelaide Hills, or out along Port Wakefield Road gives the alternator time to do its job.

If longer drives don't suit your routine, a smart battery charger or maintainer at home is the easiest fix. Connect it overnight every week or two, or leave a maintainer connected on a car that sits for long periods. Make sure the charger suits your battery type, especially AGM, EFB or lithium. See how to charge a car battery for the safe way to do it.

Other habits that help:

• Switch off the headlights, fan and demister before you turn the engine off, so the next start isn't loaded up.
• Unplug accessories that run from always-on sockets when the car is parked.
• Keep the battery terminals clean and tight.
• Have the battery tested before winter, when cold starts are hardest.

When to get it checked

If a full charge doesn't fix the problem, or the battery is going flat after a day or two, get the battery and charging system tested. A quick check can tell you whether the battery is worn out, the alternator isn't charging properly, or something is draining power while the car is parked. Our guide to testing a car battery shows what you can check yourself first.

Mobile auto electricians can test and replace batteries at your home, which is handy when the car won't start. See our pages for the Eastern Suburbs and Modbury.

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Questions Adelaide drivers ask

How long do I need to drive to recharge my car battery?

There's no single answer, as it depends on how flat the battery is, the alternator, what accessories are running and whether the car has a smart alternator. A short trip of a few minutes rarely replaces the charge used to start the engine. A longer run at steady speed every week or so helps, but a smart charger at home is more reliable.

Why has my stop-start stopped working?

Most stop-start systems switch themselves off when the battery charge is low, the battery is worn, or other conditions aren't met, such as the engine not yet warm or high demand from the air conditioning. If stop-start rarely works any more, have the battery tested. Replace it with the same type the car was built with, usually AGM or EFB.

Is it bad to leave a battery maintainer connected all the time?

A quality smart maintainer designed for long-term connection is fine to leave on a car that sits for weeks, as it adjusts its output to keep the battery full without overcharging. Check it suits your battery type, and that it is placed safely with leads that can't be caught in doors or bonnets. An old-style unregulated charger should never be left connected.

Should I charge my flat battery or replace it?

Try a full charge with a smart charger first, then have the battery tested. If it holds its voltage and passes a load test, the problem is more likely your driving pattern or a drain, not the battery itself. If it drops quickly after charging or fails the load test, it is worn out, and charging it again will only buy a little time.

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