Bottom Line Up Front: The NOCO GENIUS5 ($89 AUD) is the best battery charger under $100 in Australia. It handles 6V and 12V batteries, includes desulfation mode, and is safe enough to leave connected indefinitely. Second pick: Projecta IC800 ($75) for a great local alternative.
What to Look for Under $100
At this price point you're looking at 4–10 amp chargers — perfect for passenger cars, SUVs, motorcycles, and caravans. The key features to prioritise:
- Smart/automatic shutoff — so you can't overcharge and damage your battery
- Desulfation mode — recovers deeply discharged batteries
- Spark-proof connections — safety first when clipping onto terminals
- Multi-stage charging — extends battery life compared to basic trickle chargers
Top 5 Battery Chargers Under $100 Australia
1. NOCO GENIUS5 — Best Overall~$89 AUD
The GENIUS5 is a fully automatic, 5-amp smart charger for 6V and 12V batteries. It charges, maintains, and repairs lead-acid, AGM, lithium-ion and lifepo4 batteries. Safe enough to leave connected all winter.
✅ 6V & 12V
✅ AGM & lithium safe
✅ Desulfation mode
✅ Thermal compensation
✅ Reverse polarity protection
✅ 5-year warranty
Check Price on Amazon AU →
2. Projecta IC800 — Best Australian Brand~$75 AUD
Projecta is an Australian brand with wide availability at Supercheap Auto and Repco. The IC800 is an 8-stage smart charger that handles 12V batteries up to 120Ah — suitable for most passenger vehicles.
Check Price on Amazon AU →
3. CTEK MXS 3.8 — Best for Maintenance~$95 AUD
The MXS 3.8 is CTEK's entry-level smart charger — ideal for maintaining batteries during long storage periods. Fully automatic, safe for AGM and standard lead-acid batteries.
Check Price on Amazon AU →
4. NOCO GENIUS10 — Best for Larger Batteries~$99 AUD
Step up to 10 amps for quicker charging of larger car and 4WD batteries. Everything the GENIUS5 offers, with twice the charging speed. At the top end of our budget but worth every cent.
Check Price on Amazon AU →
5. Projecta PC400 — Budget Pick~$45 AUD
If you just need something basic to charge a flat battery, the Projecta PC400 does the job. Not as smart as the others, but widely available and under $50 from most Australian auto stores.
Check Price on Amazon AU →