Workshops check an EV battery with an EV-capable scan tool that reads the high-voltage system: State of Charge shows how full the battery is, and State of Health shows how much capacity it has left compared with new. Tools such as the Autel MaxiSYS Ultra EV also show cell data and can test the pack directly.
What the numbers mean
- State of Charge (SoC) how full the battery is now, like a fuel gauge.
- State of Health (SoH) remaining capacity compared with a new battery.
- Cell voltages and temperatures show weak cells or modules.
- Fault codes from the battery management system and high-voltage components.
Why customers ask for it
Buyers of used EVs want to know the battery's condition, and owners want to know whether a range drop is normal. A printed or shared report from the scan tool answers both.
Safety first
High-voltage work needs trained staff, insulated tools and the maker's procedure. Reading data through the OBD port is low risk; opening or removing the pack is not. An EV battery lift such as the EVP501 supports the pack during removal.
Which tools can do it
The THINKCAR Expert 394 EV, the Autel MaxiSYS Ultra EV and the Autel MS909 S2 EV read EV systems on supported cars. Coverage varies by make, so check your EV brands before you buy.
Questions
Can any scanner read an EV battery's State of Health?
No. You need an EV-capable tool with coverage for that make. Basic OBD scanners usually cannot read high-voltage battery data.
Is a battery health check the same on every EV?
The idea is the same, but what each make exposes differs. Some show SoH directly; others need a deeper test of the pack.
Talk to CSKA
Tell us the cars you service and the jobs you do, and we will suggest the right tool.
WhatsApp +65 9822 2629