TW
Thomas Weber
● ActiveUrgent Riskthomas.w@fleetco.com·+61 416 005 005·DL-WA-891·Joined May 2024
ACharging Grade94/100
Assigned Vehicle
2021 Volkswagen ID.4
Trim
Pro S
License Plate
EV-2205
Chemistry
NMC
Capacity
82 kWh
EPA Range
435 km
Battery State of Health
91.2%excellent
Capacity
74.8 / 82 kWh
Degradation
8.8% from new
Rate
4.3%/yr
To 80% SOH
2.6 yrs
Confidence
medium
Lifetime Projection
Current trajectory
4.9 yrs
to battery replacement
With prescriptions
6 yrs
+1.1 yrs saved
Daily SOC target
80%
Max charge limit
80%
Charging Behaviour — 48 sessions
Avg Start SOC
41.4%
Avg End SOC
81.6%
Avg Session
152 min
Monthly Energy
1520.6 kWh
DC Fast Usage
37.5%
Deep Discharges
0%
Overcharge Events
16.7%
Overnight Chg
47.9%
Charging Time Pattern
Afternoon
29%
Evening
25%
Overnight
23%
Morning
23%
Monthly Energy Usage
Jan 26
kWh
Feb 26
kWh
Mar 26
kWh
Apr 26kWh
132.4
May 26kWh
898.4
June 26kWh
383.7
Recent Sessions
| Date | Start | End | Added | Type | Location |
|---|---|---|---|---|---|
| 2026-06-12 | 22% | 98% | 56.87 kWh | L2 | work |
| 2026-06-11 | 16% | 64% | 34.35 kWh | L2 | work |
| 2026-06-10 | 46% | 77% | 22.9 kWh | DC | public |
| 2026-06-09 | 28% | 52% | 17.98 kWh | L2 | work |
| 2026-06-08 | 64% | 100% | 26.15 kWh | L2 | home |
| 2026-06-07 | 16% | 73% | 40.88 kWh | DC | public |
Identified Risks
High DC fast charge usage (38%)high impact
Fix: Use AC Level 2 for regular charging. Reserve DC fast for travel only.
Frequent full 100% charges (17% of sessions)high impact
Fix: Set vehicle charge limit to 80% in app settings.
Charging Prescriptions
Reduce DC Fast Charging to ≤ 20% of sessionshigh
Each fast charge session increases cell stress by 3–5×. Reducing frequency extends usable battery life by up to 1.8 years.
Now: 38% of sessions use DC Fast / Supercharger
Target: Max 1 fast charge per week. Use AC Level 2 for regular charging.
+1.2 yr battery life · $360 in degradation costs per year
Set daily charge limit to 80%high
Charging to 100% regularly accelerates electrolyte oxidation in NMC chemistry. Limiting to 80% extends cycle life by up to 40%.
Now: 17% of sessions charged to 100%
Target: Daily limit: 80%. Charge to 100% only before long trips.
+0.4 yr battery life
Predictive Maintenance Schedule
SoonOct 2026
NMC Electrolyte Check
NMC chemistry is sensitive to high SOC storage and elevated temperature. Electrolyte condition degrades faster above 85% regular charge level.
$80–$140+18 mo life
Set charge limit to 80% for daily use. Only charge to 100% before long trips.
PlannedJune 2027
Battery Health Inspection
Scheduled health inspection based on current SOH of 91.2%. Inspection every year recommended.
$95–$160+4 mo life
Full diagnostic scan including BMS logs, capacity test, and cell impedance check.
PlannedDec 2026
BMS Software Update
Manufacturer BMS updates often improve cell balancing algorithms and charge curve accuracy, extending usable life.
Free+6 mo life
Check for OTA updates via vehicle manufacturer app. If unavailable, request update at next service.