Case Study · Real Data

305,000 km.
98% Supercharging.
What's left of the battery?

An anonymised SoHWHAT deep-dive analysis of a Tesla Model Y Long Range from Giga Berlin. 47 parameters. 96 individual Bricks. The truth about excessive fast charging, made visible at cell level.

Test Your Own Battery What is the TrueHealth Score?

Results

SOH 72,9% — nach 304.986 km

Of the original 78.8 kWh capacity, nominally 57.4 kWh remain. The actual usable capacity is even lower due to cell imbalance.

72,9%

State of Health

−21,4

kWh lost

~619

Full Cycles

49/100

TrueHealth Score

49 THS

⭐⭐ Limited

The TrueHealth Score considers not just SOH, but also cell balance, HV isolation, BMS errors, moisture and wear. A SOH of 73% alone doesn't tell the whole story — the CAC spread of 24.4 Ah pulls the score down to 49.

BMS Status

30/35

Isolation

15/15

Moisture

12/12

Capacity

4/15

Wear

4/15

Cell Health

0/8

⚡ Key Finding

98.2% DC Fast Charging — the elephant in the room

Of the total 52.251 kWh of energy charged, only 715 kWh came from AC charging. The rest: Supercharger. Every day. Three years.

⚡ 98,2% Supercharger

🔌

39.499 kWh DC 715 kWh AC

🔥 What This Means

Every DC charging session at high current generates heat in the cells. With 98% Supercharger usage, this battery experienced more thermal cycles in 3 years than a typical vehicle sees in 10 years. The result: asymmetric degradation — not all modules are affected equally.

📊 For Comparison

A typical Model Y of the same age has a DC ratio of 15–30%. Degradation then sits at ~5% per 100k km instead of the measured 8.9% per 100k km. The difference is almost entirely attributable to charging behaviour.

Deep Dive

96 Bricks. 4 Modules. One problem child.

SoHWHAT measures the capacity (CAC) of every individual Brick. Here we see what a simple SOH value hides: Module 4 is drastically more degraded.

Module 1

Brick 1–23

Ø 194,2 Ah

Spread: 7,8 Ah

Module 2

Brick 24–48

Ø 194,7 Ah

Spread: 7,6 Ah

Module 3

Brick 49–73

Ø 193,9 Ah

Spread: 8,7 Ah

Module 4

Brick 74–96

Ø 181,6 Ah

Spread: 16,0 Ah

Brick-Level Capacity Heatmap (96 Bricks, CAC in Ah)

173 Ah

198 Ah

The last 10 Bricks (87–96, Module 4 far left) light up red. Here capacity is 10–15% below the pack average. This limits overall range, because the BMS throttles at the weakest Brick.

🔍 Why Exactly Module 4?

Honest answer: We don't know. And that's exactly the point. A simple SOH value would have hidden this problem entirely. Only brick-level analysis reveals that a module is falling behind — and by how much.

The result: 24.4 Ah CAC spread — caused almost exclusively by Module 4. Whether it's thermal effects, manufacturing tolerances or coolant loop geometry: SoHWHAT can diagnose it before it becomes a real problem.

SoHWHAT Analysis Depth

47 Parameters. No guessing.

A simple SOH value would have said “73% — still OK” here. SoHWHAT shows the full picture:

🔋

96 Individual Brick-CAC

Capacity of every individual cell group — not just an average.

📊

4-Module Degradation Analysis

Which module degrades faster? Here: Module 4 at 13 Ah below average.

⚡

Charging Profile Analysis

DC vs. AC ratio, total energy, efficiency — the battery usage profile.

💧

Moisture Measurement

Gram-precise moisture detection. In this vehicle: unremarkable.

🛡️

HV Isolation & Safety

Internal + external isolation resistance, HVIL interlock, 12V status.

🔬

dSOC Weak Short Detection

Detects internal short circuits at brick level — before they become a problem.

EXPERT

✅ 47 Parameter
✅ 96 individuelle Brick-CAC
✅ Modul-Degradation sichtbar
✅ Moisture measurement
✅ dSOC Weak Short Detection
✅ TrueHealth Score (6 Kategorien)
✅ 5 minutes, standard OBD adapter

Typical Competitor

❌ ~15 Parameters
❌ Pack average only
❌ No module analysis
❌ No moisture measurement
❌ No Weak Short detection
❌ SOH as only metric
❌ Proprietary hardware, 7-day test

Conclusion

SOH alone is not enough.

This vehicle has 73% SOH. “Still OK,” most would say. But the brick-level analysis shows: 10 of 96 Bricks are below 180 Ah. Module 4 degrades twice as fast as the rest. This limits range, charging power and lifespan — and no simple SOH test reveals that.

Know what's really inside. Data you can trust.

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This case study is based on a real, anonymised SoHWHAT analysis. All data was collected using the SoHWHAT app and an OBDLink MX+.

305,000 km. 98% Supercharging. What's left of the battery?

📋 Vehicle Profile