Why does my car battery keep dying?
If your battery keeps going flat, it's usually one of three things: the battery is simply worn out, the alternator isn't charging it, or something is draining it while the car's parked (a parasitic drain). Testing the battery, alternator and draw tells you which — so you replace the right part, not just the battery again.
The most common causes
Most batteries last 3–5 years in our heat; an old one won't hold charge. Tested and replaced on-site.
Battery 4+ years oldIf the battery keeps dying after a fresh charge or a new battery, the alternator isn't keeping it topped up.
Dies after a new batteryA light, module or accessory staying awake drains the battery overnight while parked.
Flat after sitting overnightCorroded or loose battery terminals stop a proper charge and discharge.
Lots of short trips, or aftermarket accessories, can outpace the charging on an older battery.
What it costs in Sydney
| Battery (tested, supplied & fitted) | from $180 |
| Alternator (fitted) | from $549 |
| Mobile diagnostic (drain / charging test) | $129 |
Get it diagnosed — in your driveway.
We test the battery, the alternator and any parasitic drain on the spot — so you fix the real cause, not just the symptom.
Common questions
If a freshly charged or brand-new battery still goes flat, it's usually the alternator not charging. We test both so you only replace what's actually failed.
Something staying powered while the car's parked — a light, module or accessory — slowly flattening the battery overnight. We can measure the draw and trace it.
Yes — we test and fit batteries on-site across the Hills & Western Sydney.