In brief
- What does a battery tester check? State of charge, cold cranking amps (CCA) and state of health of the starter battery – modern devices also test the starter and the charging system.
- 12 V or 24 V? For cars a 12 V tester is enough; if you also test trucks, you need a 12/24 V device.
- Testing AGM? Yes – but only with a tester that lets you set the battery type (AGM, GEL, EFB).
- How much does a good battery tester cost? Workshop-grade devices are available from us from 89 €, with printer from 170 €, with OBD diagnostics from 579 €.
Why the battery is the most common cause of breakdowns
The starter battery has topped the breakdown statistics for years – and it rarely fails without warning. A battery tester makes the gradual wear visible before the vehicle is left stranded. For workshops, the battery test is therefore doubly valuable: as a quick service at every inspection and as a cleanly documented basis for the sale when a new battery is due.
How a modern battery tester works
Current battery testers measure the condition via the conductance of the battery: the device determines the internal resistance and uses it to calculate the available cold cranking amps (CCA) compared with the printed rated value. The advantage over the classic load test with a high test current: the measurement takes seconds, does not stress the battery and also works on partially discharged batteries. For meaningful results it is important that the tester knows the battery type – standard wet battery, AGM, EFB or GEL are rated differently.
The most important buying criteria
- Voltage range: Cars only → 12 V is enough. Cars plus trucks/vans → 12 V and 24 V.
- Battery types: AGM and EFB support is a must as soon as start-stop vehicles come into the workshop.
- System tests: Good devices also check the starter (voltage drop on starting) and the charging system (alternator voltage, ripple) in addition to the battery.
- Test report: A built-in printer provides proof for the customer – which makes the battery recommendation much easier.
- Documentation in the diagnostic process: Battery diagnostic devices with OBD connection register the new battery directly in the vehicle – necessary on many modern vehicles after replacement.
Our recommendations by use case
For the quick battery check: Vident iBT200 (89 €)
The Vident iBT200 tests 12 V and 24 V batteries including AGM, GEL and SLA – compact, rugged and fast. The right choice if you are looking for a reliable battery and charging system check without extras.
With a test report for the customer: Ancel BST500 (170 €)
The Ancel BST500 tests 12 V and 24 V batteries right up to truck and AGM batteries and prints the result directly. The printed test report makes the battery replacement recommendation easy for the customer to follow.
For electrical system troubleshooting: PowerScan PS100 (82,99 €) and Ancel PB100 (149 €)
When the problem is not the battery but the wiring: the PowerScan PS100 and the Ancel PB100 test voltage, ground and continuity in the 12/24 V electrical system and replace test lamp and multimeter in a single tool.
Battery diagnostics with vehicle registration: Autel MaxiBAS BT608 (579 €) and BT609 (749 €)
The Autel MaxiBAS devices combine the battery test with OBD diagnostics: the BT608 and the BT609 also read fault codes and register the new battery in the control unit after replacement – the complete solution for workshops that offer battery service professionally.
Battery tester “test winners” – what really matters
Many people search for the “test winner” among battery testers. Our advice from practice: what counts is not the position in a ranking but the intended use – a 12 V DIY device is of no use in a truck fleet, and anyone servicing start-stop vehicles absolutely needs AGM/EFB support. The four criteria above lead to the right device more reliably than any ranking.
Frequently asked questions
Can I test an AGM battery with any tester?
No. The tester must know the AGM battery type, otherwise it will misjudge the readings. All battery testers recommended above support AGM.
Does a new battery have to be registered in the vehicle?
On many modern vehicles with intelligent battery management: yes. This requires a device with OBD access such as the MaxiBAS BT608/BT609 or a diagnostic tool with a battery registration function.
Isn’t a multimeter enough?
A multimeter only shows the resting voltage – it says little about the actual condition and the available cold cranking amps. Only a battery tester determines the state of health.
You will find all devices in the Battery testers for cars & trucks category – if you have questions, we are happy to advise you by phone: 0711-3654 4645. Purchase on account possible (Klarna or PayPal).