What a hybrid or EV battery health report tells you

The state-of-health score, block voltages and what good, fair and poor mean when you own, buy or sell.

The short answerA battery health report gives a state-of-health (SoH) score: how much of its original capacity the battery still holds. For most hybrids, above 80% is healthy, 65 to 80% is fair and worth re-testing in a year, and under 65% means the battery is near the end of its life. The report also shows whether any block is weaker than the rest, which matters more than the headline number.

The main numbers

State of health (SoH): the capacity left, as a percentage of new.
Weak blocks: blocks that charge or drain faster than the others. One weak block can drag the whole battery down.
Test method: a full charge and discharge test is the most thorough. A quick scan only reads what the car reports.

Good, fair or poor

Good (80% and over): normal for most hybrids up to 10 years old.
Fair (65 to 79%): usable, but re-test in 12 months.
Poor (under 65%): expect to rebuild or replace it soon. Read rebuild, replace or secondhand.

Why the record matters

In AutoPlace Garage, each test from an approved shop is stamped to your car, so you can see the trend over time. A steady drop is normal. A sudden drop is worth a specialist's look. When you sell, a stamped record shows buyers the battery has been looked after.

Buying a used hybrid or EV

Ask for a recent battery health report, or have one done as part of a pre-purchase inspection.

Questions drivers ask

How often should I test my hybrid battery?

Every year or two once the car is about 8 years old, and before you buy or sell.

Is an EV battery report different?

It measures the same thing, the capacity left. EVs often show it on the dash or in an app, but a shop test is more reliable.

Checked by AutoPlace editorial team. To be checked by a hybrid technician before launch. Updated 5 October 2026.