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REAL VEHICLE WORKFLOW

EVeium Battery Diagnostics

Real-vehicle battery diagnosis for Cosmo, Comet and Czar using measured evidence, BMS data and technician observations.

Start real diagnosis Explore Generic 72-V Battery Digital Twin

The toolkit never claims hidden EVeium battery construction: published values carry their sources, everything else stays UNKNOWN. Use this toolkit to structure and document real EV battery diagnosis. Vehicle-specific repair procedures must follow verified manufacturer service information. No live EVeium BMS connection is provided.

Real vehicle diagnosis

Select the model, record the evidence, decide the next test

Safety screen first. Every measurement starts NOT MEASURED. A complaint never creates a repair decision on its own.

EVeium model

Variant: Not specified · Model year: entered by the technician.

Select the EVeium model on the workshop floor. The diagnosis below works without one, but the published specification helps.

REAL VEHICLE DIAGNOSISStructure and document the diagnosis of a physical scooter.
  1. 1Customer Complaint Record what the customer reports, in their words. A complaint is a starting point, never a diagnosis.
  2. 2Safety Screen Check for hazards before anyone touches the pack.
  3. 3Vehicle & Battery Identification Vehicle, model, year, odometer, battery ID and the pack's rated values.
  4. 4Visual Inspection External checks only: enclosure, connectors, water, corrosion, swelling, smell and heat.
  5. 5Electrical Measurements Pack voltage, charger output, charge and discharge response.
  6. 6BMS / Diagnostic Data SOC, SOH, status, fault codes, enable states and communication.
  7. 7Cell / Module Comparison Group minimum, maximum, delta, load behaviour and confirmed pack configuration.
  8. 8Thermal Inspection Temperatures, spread, sensor count and hot-spot location.
  9. 9Root-Cause Analysis Candidates with their evidence and the evidence gate.
  10. 10Repair Decision Decision, reason, evidence, missing evidence, risk and the next action.
  11. 11Repair Action What was done and which parts were replaced.
  12. 12Post-Repair Test After-repair measurements, checks and comparison.
  13. 13Customer Report Job card and diagnostic report.

EVeium Cosmo / Comet / Czar: battery and battery-related interfaces only, not whole-vehicle servicing.

Nothing is pre-filled. Every field starts as NOT MEASURED until you record it, and each value keeps its origin: MEASURED, USER ENTERED, NOT MEASURED, NOT AVAILABLE or UNKNOWN — and, for rated values, MANUFACTURER VERIFIED or THIRD-PARTY DOCUMENTED.

No customer personal details are needed. Everything you enter stays in this browser tab.

Reference diagnostic logic. Validate limits against the selected battery, BMS and manufacturer service information before making a real repair decision.

PUBLICLY DOCUMENTED / THIRD-PARTY CORROBORATED

Publicly Documented Battery Specification

Published by EVeium and corroborated by 2022 launch coverage. Cell chemistry, cell format, series / parallel count, BMS protocol and connector pinout are not published and are not shown.

Cosmo

Nominal voltage
72 V
Capacity
30 Ah
Battery
Lithium-ion
Nominal energy
2.16 kWh
Motor (vehicle context)
2000 W
Claimed range
100 km

72 V × 30 Ah = 2160 Wh = 2.16 kWh

CALCULATED FROM PUBLISHED NOMINAL VOLTAGE AND CAPACITY. Range is a claim, not a test result.

Comet

Nominal voltage
72 V
Capacity
50 Ah
Battery
Lithium-ion
Nominal energy
3.60 kWh
Motor (vehicle context)
3000 W
Claimed range
165 km

72 V × 50 Ah = 3600 Wh = 3.6 kWh

CALCULATED FROM PUBLISHED NOMINAL VOLTAGE AND CAPACITY. Range is a claim, not a test result.

Czar

Nominal voltage
72 V
Capacity
40 Ah or 42 Ah
Battery
Lithium-ion
Nominal energy
2.88 or 3.024 kWh
Motor (vehicle context)
4000 W
Claimed range
120–150 km

72 V × 40 Ah = 2880 Wh = 2.88 kWh (manufacturer website) · 72 V × 42 Ah = 3024 Wh = 3.024 kWh (2022 launch coverage). Sources disagree — confirm on the pack label.

CALCULATED FROM PUBLISHED NOMINAL VOLTAGE AND CAPACITY. Range is a claim, not a test result.

CALCULATED FROM PUBLISHED NOMINAL VOLTAGE AND CAPACITY — not a measured usable energy. Czar capacity: EVeium's website states 40 Ah; 2022 launch coverage states 42 Ah (3.02 kWh). The toolkit publishes both and asks the technician to read the pack label.

Sources

Intentionally transparent

Technical Data Still Requiring Verification

  • Exact cell chemistry
  • Cell manufacturer
  • Cell format
  • Series / parallel arrangement
  • BMS manufacturer
  • BMS protocol
  • Connector pinout
  • Fuse rating
  • Charge current limit
  • Discharge current limit
  • Thermal thresholds
  • Balancing thresholds
  • Exact pack location
  • Exact removal sequence
  • Internal mechanical layout

The toolkit is ready to take, without redesign: service manual, oem diagnostic procedure, connector pinout, bms communication map, cell layout, internal pack photographs, verified removal sequence, component part numbers — once an authoritative source exists.

Battery location

Battery Location: NOT YET VERIFIED

Use physical inspection and authorised service documentation to confirm battery location and service access.

SCHEMATIC VEHICLE — NOT OEM GEOMETRY

Generic scooter schematic — NOT OEM GEOMETRY

GENERIC 72-V BATTERY ARCHITECTURE · NOT VERIFIED AS EVeium INTERNAL PACK CONSTRUCTION

EVeium's specifications state a lithium-ion swappable battery. No removal path is shown as fact. To study a generic 72 V pack — modules, cell groups, BMS, thermal and current paths — open the generic digital twin.

Explore Generic 72-V Battery Digital Twin

EVeium battery questions

EVeium battery diagnostics, answered

What battery does the EVeium Cosmo use?
EVeium publishes a 72 V, 30 Ah lithium-ion battery for the Cosmo. 72 V × 30 Ah = 2.16 kWh nominal energy, calculated — not a measured usable energy.
What battery does the EVeium Comet use?
EVeium publishes a 72 V, 50 Ah lithium-ion battery for the Comet: 3.60 kWh nominal energy, calculated from the published voltage and capacity.
What is the EVeium Czar battery capacity?
Sources disagree. EVeium's website states 72 V 40 Ah (2.88 kWh calculated); 2022 launch coverage reported 72 V 42 Ah (3.02 kWh). Read the rated capacity from the pack label.
Is the EVeium battery removable?
EVeium's specifications list a lithium-ion swappable battery. The battery location and removal procedure are not published; confirm them by inspection and authorised service documentation.
How do I diagnose an EVeium scooter that is not charging?
After the safety screen: measure battery open-circuit voltage and charger output, observe the charge response, measure pack voltage and current during charging, then check BMS charge enable, connectors, temperature and fault codes. Do not blame the charger or the BMS without that evidence.
What causes range loss on a 72 V scooter battery?
Ageing, low usable capacity, a weak cell group, cell imbalance, high internal resistance, SOC estimation error, thermal limitation or connector resistance. A range complaint alone never justifies battery replacement; measured evidence does.
Which BMS protocol does EVeium use?
Not publicly verified. Record CAN, UART, BLE or other only if you have confirmed it physically on the vehicle.
Does this toolkit connect to the EVeium BMS?
No. V1 supports manual entry and CSV / JSON import from a tester or BMS export. There is no live EVeium BMS connection.

EVeium is a separate company. EV.ENGINEER™ is not affiliated with or endorsed by EVeium; specifications are cited from their public sources.