Cylindrical LiFePO4 Battery
VTC-LF18650 3.2V 2000mAh Cell
A compact rechargeable cell for engineered lighting, instrumentation, monitoring and backup-power assemblies.
1. Product overview
The VTC-LF18650 is a 3.20V nominal, 2000mAh cylindrical LiFePO4 cell in the 18650 format. It is designed as a bare cell for integration into equipment or a properly engineered battery pack. The combination of standard cylindrical packaging, LiFePO4 chemistry and a specified 3C maximum continuous discharge supports a broad range of compact industrial and commercial power designs.
2. Core electrical parameters
| Parameter | Specification |
|---|---|
| Model | VTC-LF18650 |
| Battery Type | Cylindrical LiFePO4 Battery |
| Nominal Voltage | 3.20V |
| Nominal Capacity | 2000mAh |
| Charge / Discharge Limits | 3.65V charge; 2.50V discharge cut-off |
| Standard Charge / Discharge | 0.2C / 0.2C |
| Maximum Continuous Current | 1C charge; 3C discharge |
| Internal Impedance | ≤50mΩ at 1kHz, 50% charge |
| Dimensions / Weight | Ø18.05 × 65.10mm max; approx. 40.5g |
| Operating Temperature | Charge: 0 to 45°C; discharge: -20 to 60°C |
Standard charging applies 0.2C constant current until the cell reaches 3.65V, followed by constant-voltage charging until current tapers to 0.01C. Standard discharge is 0.2C to 2.50V. Internal impedance is specified at no more than 50mΩ when measured at 1kHz after 50% charge under the stated cell-age and cycle conditions.
3. Cell size and structure
The bare cell uses a standard cylindrical form intended for compatible holders or welded pack interconnects. The maximum dimensional limits should be used when designing the enclosure and contact system.
| Source label | Description | Dimension |
|---|---|---|
| T | Cell diameter | 18.05mm max |
| D | Cell height | 65.10mm max |
| Weight | Bare cell mass | Approx. 40.5g |
4. Temperature and storage
Charging is specified from 0 to 45°C, while discharge is specified from -20 to 60°C. Storage guidance varies by duration: 0 to 25°C for less than one year, -10 to 40°C for less than three months, and -20 to 50°C for less than seven days, at the stated shipment condition. Equipment designers should account for enclosure temperature, solar loading, ventilation and charging behavior rather than relying on ambient temperature alone.
5. Cycle life and retention
The cycle-life test calls for 2000 charge/discharge cycles at 0.2C with 30-minute rest periods and a test temperature of 20±5°C. The acceptance criterion is capacity higher than 80% of the initial value. Actual service life depends on depth of discharge, charge voltage accuracy, current, temperature, storage state and pack balancing.
Temperature-dependence criteria at 0.2C are listed as 50% capacity at -10°C, 80% at 0°C, 100% at 23°C and 95% at 60°C relative to the 23°C result under the specified test preparation.
6. Protection and pack engineering
This item is a bare cell; no built-in PCM, NTC, wire or connector is specified. A finished battery assembly should use application-appropriate overcharge, over-discharge, over-current and short-circuit protection, together with compatible cell holders or welded interconnects, insulation rings and mechanical retention. Charging must use a LiFePO4-compatible CC/CV profile and must stay within the specified voltage, current and temperature limits.
7. Application fit
Suitable design targets include solar garden and pathway lighting, emergency luminaires, portable measuring instruments, wireless security sensors, industrial sensor nodes, compact network backup modules, portable field radios and custom multi-cell LiFePO4 packs. Final suitability depends on the equipment’s peak current, duty cycle, charging system, thermal design and required operating time.
8. VTCBATT OEM/ODM supply
VTCBATT supports sample evaluation, factory-direct cell supply, wholesale orders and stable batch production. For custom battery-pack projects, engineering options can include series/parallel configuration, cell matching, holders, nickel interconnects, insulation, PCM/BMS selection, NTC configuration, wire length, connector matching and private labeling. Project specifications should be confirmed against the finished equipment’s electrical, thermal and mechanical requirements.
