SYSTEM ONLINE · BUCHAREST WORKSHOP
Battery check and repair · hybrid, plug-in, electric
Battery diagnostics / check
Hybrid / Electric cars
The high-voltage battery is the most expensive component of a hybrid or electric car. We assess it by measurement, not estimation: the remaining capacity, the condition of every module and whether a repair makes sense. The results are recorded in an SOH certificate with a QR code, verifiable online.
- ✓SOH CERTIFICATE WITH QR CODE
- ✓HYBRID · PLUG-IN · ELECTRIC
- ✓NO OPENING FOR THE IN-CAR CHECK
SELECT SCENARIO
Which check do you need?
Pick your situation and we point you to the right check, so you do not pay for what you do not need.
- 01You are about to buy a used carThe battery is the most expensive part of an electrified car. Find out its condition before you sign.> RUN: Full in-car diagnosis ↓
- 02The range has dropped or a warning is onWe read the battery without opening it and tell you whether it is normal wear or a fault.> RUN: Full in-car diagnosis ↓
- 03You were advised to replace the batteryOften only a few modules are degraded. The bench test pinpoints them, and a battery repair can be a more economical alternative to a new battery.> RUN: Full bench test ↓
- 04The car will not start or shows unusual faultsThe cause is not always the high-voltage battery; sometimes it is the 12 V battery, checked in the same diagnosis.> RUN: Full in-car diagnosis ↓
MODULE 01 · IN-CAR READ
What the tester sees, in minutes
We plug into the diagnostic port and read every module block, the temperatures, the cooling fan and the stored faults. Without opening the battery, we learn whether it is normal wear or a problem worth investigating.
TEST MODULES
Hybrid battery diagnostics and repair
Each one ends with an SOH certificate with a QR code: the measured values and our advice, verifiable by anyone.
Full in-car diagnosis
The high-voltage battery, the 12 V battery and the whole hybrid system, checked without removing anything.
PROTOCOL
- Battery state of health (SOH), where the car reports it
- The voltage of every module block and the spread between them
- Battery temperatures and how the cooling works
- High-voltage insulation check
- The inverter, the charging system and the high-voltage wiring
- Faults stored in the car’s computers
- The 12 V battery, measured rather than just read, and how the DC-DC converter charges it
- When buying a used car: an objective assessment of its condition
WHEN
When the range has dropped, a warning appears, the car will not go into “Ready” mode, or you are about to buy a used hybrid or electric car.
Book →(prices do not include VAT)
Full bench test
The battery is removed and every module is measured individually.
PROTOCOL
- The battery removed and split into modules
- Every module charged and discharged on its own channel of the bench
- The real capacity of every module, not an estimate
- The exact list of degraded modules
- Our reasoned advice: repair or replace
WHEN
When you have been advised to replace the battery. Before investing in a new one, the test shows how many modules are actually degraded and whether a battery repair is the better option.
Book →(prices do not include VAT)
SOH CERTIFICATE · TAMPER-PROOF
A certificate nobody can fake
Selling your car? The SOH certificate shows the buyer the real state of the battery. And if they wonder whether the sheet was made on a computer, the answer is in their pocket.
- 01The seller shows the certificatePrinted or on a phone, with the values we measured and a QR code.
- 02The buyer scans the QR codeWith the phone camera, in seconds. No app needed.
- 03They see the data on our websiteWhen the certificate was issued, for which car, what we measured and our phone number, if they want us to confirm it.
⚠ Tip for buyers: always check that the page that opens is on evhybridservice.ro.
EV HYBRID SERVICE
Battery SOH certificate
- Certificate no.
- EHS-2026-000123
- Vehicle
- Toyota Prius · 2017
- VIN
- •••••••••••K123456
- Test date
- 14 Oct 2026
- Max ΔV between blocks
- 0.018 V
- SOH
- 87%
Scan to verify
● VALID
MODULE 02 · 36-CHANNEL BENCH
Hybrid battery repair starts on the test bench
The battery is removed and opened, and every module is connected to its own channel of the bench. The bench charges and discharges all modules at once and measures the real capacity of each. This pinpoints the degraded modules, so the hybrid battery repair is limited to them rather than replacing the whole pack.
See the equipment →MODULE 03 · WEAR ESTIMATOR
How much has the battery probably aged?
An estimate based on studies of thousands of electric cars. Only a measurement gives the real figure.
VEHICLE TYPE
DC FAST CHARGING (>100 kW)
ESTIMATED SOH
91%
likely range 87–94%
ageing rate ≈ 2.3%/yr
- - 70% · the floor most makers guarantee
Get the real figure →sources: Geotab 2026 · Recurrent 2026
DECODE
How to read an SOH figure
SOH (state of health) shows how much of its original capacity the battery still has. At 85%, a car that used to do 400 km now does about 340 km in the same conditions.
<70%
Below the warranty floor
Below 70%. If the car is still under warranty this may justify a claim; otherwise the bench test shows whether a battery repair is possible.
70–80%
Needs monitoring
Visible wear, close to the threshold most makers guarantee.
80–90%
Normal wear
Usual for a car a few years old. The range drops a little; the car is perfectly usable.
90–100%
Very good condition
Minimal wear; the range is practically what it was new.
FLOW
How the check works
- 01
Booking
Online or by phone. Tell us the car and what you have noticed.
- 02
In-car diagnosis
We connect the tester and read every module block, the temperatures and the faults.
- 03
Bench test, if needed
Only if the reading shows a problem and you want to know exactly how many modules are affected.
- 04
The SOH certificate
With the measured values, our advice and a QR code anyone can use to verify it on our website.
PROOF
We do not just measure, we repair
CASE · MITSUBISHI OUTLANDER PHEVReal job: a Mitsubishi Outlander PHEV battery rebuilt cell by cellMore than 0.5 V between cells had stopped the car. We tested all 80 cells and brought the battery back to an SOH of 80–90%.Read the job →FAQ
Frequently asked questions
Can a hybrid battery be repaired?+
Yes, in many cases. A hybrid battery is made of modules, and wear does not affect them all equally. After the bench test we replace only the degraded modules and balance the pack, which usually costs less than a new battery.
How much do hybrid battery diagnostics and repair cost?+
The full in-car diagnosis costs €100 (VAT not included). The repair cost depends on the model and the number of degraded modules, so we quote it after the bench test, before any work is done.
Does every hybrid report battery health (SOH)?+
No. Most electric cars do, but many hybrid models do not. In those cases we analyse the voltage of each module block and the spread between them, which show the condition of the battery just as clearly.
Is the battery removed for the in-car diagnosis?+
No. The in-car diagnosis uses the diagnostic port and measuring equipment, without removing the battery. Only the full bench test requires removing it.
What documents do I receive after the check?+
An SOH certificate with the measured values and our advice, which we explain to you. Its QR code lets anyone verify on evhybridservice.ro when it was issued and the values it records, so the document cannot be forged.
Do you check electric cars too, not just hybrids?+
Yes: full hybrids, plug-in hybrids and electric cars, from all the major makes.
How accurate is the calculator on this page?+
It gives an estimate based on studies of thousands of electric cars and is useful as a reference. A particular battery depends on the climate it operated in, the mileage and how it was charged; the real value comes only from a measurement.
Start the diagnosis.
Tell us the car and what you have noticed. We will call you back with an appointment.