If you’ve got a car that’s slow to start or you’re prepping for a roadie, you might be thinking of grabbing a multimeter to test your battery. But here’s the catch—a multimeter can only tell you how charged your battery is, not how healthy it is.
Let’s break it down so you know what tool to use, when, and why.
What a Multimeter Can Do
A multimeter is great for checking voltage. That means it can tell you roughly how much charge your battery has in it:
| Multimeter Reading | What It Suggests |
| 12.6V – 12.8V | Fully charged |
| 12.4V – 12.6V | Around 75% |
| 12.2V – 12.4V | Around 50% – could use a charge |
| 12.0V or below | Flat or close to it |
This is helpful—but it doesn’t give the full picture.
What a Multimeter Can’t Do
A battery might still show 12.6V on a multimeter and still be faulty.
Why? Because multimeters don’t test load or cranking performance. That means they can’t tell if:
- Your battery can handle starting your car
- It’s holding charge under load
- It’s got internal faults
In short: a multimeter can’t test the actual health of your battery.
What You Need Instead: A Battery Tester
To properly test your battery’s health, you need a dedicated battery tester. These simulate a real-world load and can measure:
- Cranking amps (CCA)
- Battery health
- Charging system performance
You can grab a handheld battery tester for around $80 on Temu, or better yet…
Come See Us for Free Battery Testing
Pop into Battery Warehouse and we’ll test your battery for free. No guessing, no tech talk—just fast, honest advice and a proper test with professional tools.
Whether you’re in Tauranga, Mount Maunganui or beyond, we’re just down the road and happy to help.
14 Palm Grove, Judea, Tauranga
0800 BATS4U
www.batterywarehouse.co.nz
Battery Warehouse – Batteries for Everything. Advice You Can Trust.
