On a long Australian road trip, your phone is your map, your music, your camera, and your lifeline between towns — and there is nothing worse than watching the battery drain faster than it charges while GPS runs. A good car charging setup keeps everyone powered from the Nullarbor to the Great Ocean Road. This guide walks through the car charger, cables, mount, and backup power you need, and how to choose each for reliability over distance.
Why road trips are hard on your phone's battery
Navigation is the culprit. Running GPS with the screen on, especially at full brightness in bright sunlight, draws a lot of power — often more than a low-quality car charger can replace. Add music streaming over Bluetooth, hands-free calls, and hot cabin temperatures, and it is entirely possible for a phone to slowly drain while plugged in. That is the exact situation a proper setup is designed to prevent.
The fix is not just "a charger" but a matched chain: a charger that delivers enough power, a cable that can carry it, a mount that keeps the phone visible and cool, and a power bank for when you are away from the car. Get all four right and battery anxiety disappears. Our full guide to phone charging in Australia covers the underlying principles if you want the deeper background.
Choosing the right car charger
The charger is the heart of the setup, and the key numbers are wattage and ports. For modern phones running navigation, look for a charger that supports fast charging — USB-C Power Delivery (PD) is the standard to want — with enough wattage to charge faster than GPS drains. An 18W port is a sensible minimum for a single phone; higher is better if you are also charging a tablet or a second device.
Single vs multi-port
- Multi-port chargers are ideal for families — two phones and a tablet can charge at once. Check the total output, though: a charger may not deliver full speed to every port simultaneously.
- PD and PPS support matters for fast, efficient charging of newer phones, including many Samsung and Google devices.
- Build quality counts in a hot cabin. A cheap, no-name charger that runs hot is a false economy and a safety risk.
Browse the range of car chargers at Repair Mart to compare PD and multi-port options. If you want to understand the fast-charging standards in plain English first, our explainer on PD, PPS and GaN is a helpful primer.
Don't overlook the cable
A charger is only as good as the cable feeding your phone. A thin or low-spec cable can bottleneck a fast charger, so the phone charges slowly even though the charger is capable. For fast charging you need a cable rated to carry the current — a good USB-C to USB-C cable for most modern Android phones, and USB-C to Lightning for older iPhones.
Length matters on a road trip too. A cable that is too short forces the phone into an awkward position; too long and it tangles. Aim for one that comfortably reaches your mount. Carry a spare — cables are the component most likely to fail, and being stuck without a working one hundreds of kilometres from a shop is a genuine hassle. Our guide to why not all USB-C cables charge at the same speed explains what separates a fast cable from a slow one.
Mounting and keeping the phone cool
A car mount is not just convenience — it is safety and thermal management. A phone mounted at eye level is safer to glance at and stays out of direct sun better than one flat on the dash. Choose a mount that holds your phone securely on rough outback roads and is easy to use one-handed.
Mount types
- Vent mounts sit in the air vents, which can help keep the phone cooler — a real advantage when GPS and charging both generate heat.
- Suction and dash mounts hold firmly but can loosen in extreme heat, so check the fixing on hot days.
- Magnetic mounts make docking effortless; pair them with a compatible case or plate.
Heat is the enemy of both charging and battery life. A phone running hot will throttle its charging speed to protect itself, so keeping it out of direct sun in a well-ventilated spot actually helps it charge faster. Browse the car mounts at Repair Mart to find a secure fit for your vehicle.
Backup power for off-grid stops
The car covers you while driving, but Australian road trips involve long stretches away from the vehicle — campsites, hikes, beaches, and towns where the caravan park powers down. A power bank is the insurance policy. For a phone, a 10,000mAh bank gives roughly two full charges; 20,000mAh suits multiple devices or several days off-grid.
Two practical notes. First, choose a power bank with fast-charging output so it tops up your phone quickly. Second, if you are flying any leg of the trip, airline rules limit power banks to carry-on only and cap capacity — our guide to choosing a power bank in Australia covers the mAh and airline details. Keep power banks out of direct sun too, as heat is hard on them.
A smart routine is to top the power bank back up from the car charger while you drive, so it is always ready when you stop. That way the vehicle keeps both your phone and your backup charged, and you never arrive at a remote campsite with a flat bank. On longer trips it is also worth carrying a second cable dedicated to the power bank, so charging the bank and charging a phone can happen at the same time.
Putting the setup together
The complete kit is straightforward: a quality PD car charger with enough ports for your passengers, at least one fast-rated cable plus a spare, a secure and ideally vent-mounted holder, and a power bank sized to your trip. That combination keeps navigation running, phones topped up, and the whole car powered across long distances. Remember your Australian Consumer Law guarantees apply to all of it — chargers and cables must be of acceptable quality and safe, and you may be entitled to a remedy if they fail in normal use.
Frequently Asked Questions
Why is my phone draining even though it's plugged into the car?
Running GPS with a bright screen, plus music and a hot cabin, can draw more power than a weak charger or cable supplies. Use a fast USB-C PD car charger with enough wattage, a cable rated for fast charging, and keep the phone out of direct sun so it does not throttle charging to cool down.
What wattage car charger do I need for navigation?
For a single phone running GPS, an 18W USB-C Power Delivery port is a sensible minimum, and more headroom helps. If you are charging several devices, choose a multi-port charger and check its total output, since it may not deliver full speed to every port at once.
Does the cable really affect charging speed in the car?
Yes. A thin or low-spec cable can bottleneck a capable charger, so your phone charges slowly. Use a USB-C to USB-C cable rated for fast charging (or USB-C to Lightning for older iPhones), and carry a spare, since cables are the component most likely to fail on a long trip.
What size power bank should I take on a road trip?
A 10,000mAh power bank gives a phone roughly two full charges, which suits day trips and short hikes. For multiple devices or several days off-grid, 20,000mAh is better. If you are flying any leg, remember power banks must go in carry-on and are capacity-limited, so check the airline rules first.
Is it safe to leave my phone charging on the dashboard?
It is best avoided. Direct sun and a hot dashboard push the phone toward its thermal limits, which slows charging and ages the battery over time. Mount the phone in a shaded, ventilated position — a vent mount helps — so it stays cooler and charges more effectively.
Ready for the open road? Explore the Repair Mart car charger range and build a charging setup that keeps every phone powered from the first turn-off to the final destination.