JH
James Hartley
● ActiveUrgent Riskjames.h@axonetics.com·+61 412 001 001·DL-NSW-001·Joined January 2024
ACharging Grade80/100
Assigned Vehicle
2021 Tesla Model Y
Trim
Long Range AWD
License Plate
EV-8821
Chemistry
NMC
Capacity
82 kWh
EPA Range
531 km
Battery State of Health
93.2%excellent
Capacity
76.4 / 82 kWh
Degradation
6.8% from new
Rate
4.2%/yr
To 80% SOH
3.2 yrs
Confidence
high
Lifetime Projection
Current trajectory
5.6 yrs
to battery replacement
With prescriptions
7.3 yrs
+1.7 yrs saved
Daily SOC target
80%
Max charge limit
80%
Charging Behaviour — 48 sessions
Avg Start SOC
36.8%
Avg End SOC
85.4%
Avg Session
133 min
Monthly Energy
1788.4 kWh
DC Fast Usage
52.1%
Deep Discharges
0%
Overcharge Events
31.3%
Overnight Chg
43.8%
Charging Time Pattern
Afternoon
35%
Overnight
33%
Morning
21%
Evening
10%
Monthly Energy Usage
Jan 26
kWh
Feb 26
kWh
Mar 26
kWh
Apr 26kWh
169.2
May 26kWh
1060
June 26kWh
434.4
Recent Sessions
| Date | Start | End | Added | Type | Location |
|---|---|---|---|---|---|
| 2026-06-12 | 24% | 99% | 53.44 kWh | L2 | home |
| 2026-06-11 | 21% | 79% | 42.59 kWh | SC | public |
| 2026-06-10 | 26% | 69% | 29.85 kWh | SC | home |
| 2026-06-09 | 39% | 100% | 43.11 kWh | SC | home |
| 2026-06-08 | 29% | 54% | 17.34 kWh | L2 | work |
| 2026-06-07 | 46% | 100% | 39.26 kWh | L2 | work |
Identified Risks
High DC fast charge usage (52%)high impact
Fix: Use AC Level 2 for regular charging. Reserve DC fast for travel only.
Frequent full 100% charges (31% 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 2.5 years.
Now: 52% of sessions use DC Fast / Supercharger
Target: Max 1 fast charge per week. Use AC Level 2 for regular charging.
+1.7 yr battery life · $500 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: 31% of sessions charged to 100%
Target: Daily limit: 80%. Charge to 100% only before long trips.
+0.8 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 93.2%. 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.