Li-ion NMC/NCA • 20S CELL CONFIGURATION
72V Li-ion (20S) Battery Voltage Chart: Full (100%) to Empty (0%) Resting & Load Table
ENGINEER SUMMARY & QUICK ANSWER • 72V LI-ION (20S) TELEMETRY
A fully charged 72V Li-ion (20S) battery measures 84.0V at 100% (4.20V/cell). Its 80% longevity charge target is 79.4V, its 50% winter storage midpoint is 75.0V, and its 0% BMS low-voltage cutoff is 60.0V (3.00V/cell). Under motor load, expect a dynamic voltage sag of ~4.8V.
TOGGLE MULTIMETER MODE:
| State of Charge (%) | Pack Voltage (V) | Under Load (V) | Per Cell (20S) | Workshop Telemetry Note & Cell Zone |
|---|---|---|---|---|
| 100% | 84.0V | 79.4V | 4.20V | Full 20S Charge (84.0V) |
| 90% | 81.2V | 76.6V | 4.06V | 90% Cell Health Cap |
| 80% | 79.4V | 74.7V | 3.97V | 80% Fast Charge Target |
| 70% | 77.8V | 73.0V | 3.89V | Peak Controller Amp Draw OK |
| 60% | 76.4V | 71.5V | 3.82V | Storage Zone Upper Bound |
| 50% | 75.0V | 69.9V | 3.75V | Nominal Storage Voltage (75.0V) |
| 40% | 73.6V | 68.4V | 3.68V | Storage Zone Lower Bound |
| 30% | 72.2V | 66.8V | 3.61V | Disable Turbo / Field Weakening |
| 20% | 70.2V | 64.5V | 3.51V | Low Battery Reserve |
| 10% | 67.6V | 61.8V | 3.38V | Limp Mode — High Sag Risk |
| 0% | 60.0V | 57.5V | 3.00V | 20S BMS Cutoff (60.0V) |
Engineering Notes for 72V Li-ion (20S) Systems
Applications: High-Power 3000W–8000W Stealth Bomber Builds, Upgraded Sur-Ron 72V, Nami Burn-E 2 Max, Dualtron X.
Charger Specification: Only use a dedicated 84.0V CC/CV (5A–12A) charger. Never connect a higher-voltage charger, and never charge a pack when internal cell temperature is below 0°C (32°F).
Winter Storage Window (40%–60%): Maintain resting voltage between 75.0V and 77.2V inside an insulated or fire-resistant enclosure.
Battery Chemistry ROI & Lifespan Comparison (Li-ion NMC vs Grade-A LiFePO4)
| Battery Chemistry | Rated Cycle Life | Real Cost Per Cycle | Best Application | Direct Warehouse Deal |
|---|---|---|---|---|
| Li-ion NMC (36V / 48V / 52V) | 500 – 800 Cycles (1,200+ @ 80% Cap) | €0.42 / $0.45 per cycle | Commuter E-Bikes, Fat Bikes & E-Scooters (High Energy Density) | View 48V Smart Charger → |
| LiFePO4 Grade-A (12V / 24V / 48V) | 4,000 – 6,000+ Cycles (10-Year Life) | €0.06 / $0.07 per cycle (6x Cheaper!) | Solar Off-Grid, RV Campers, Marine Trolling, Cargo Trikes & Home Backup | Compare LiTime & EcoFlow Deals → |
72V Li-ion (20S) SPEC SUMMARY
20S MATRIX
100% MAX CHARGE
84.0V
80% DAILY CAP
79.4V
WINTER STORAGE
75–77.2V
0% BMS CUTOFF
60.0V