Cylindrical LiFePO4 Rechargeable Battery Pack
VTCBATT IFR26650LT-1S3P
3.2V 9600mAh / 30.72Wh
A protected 1S3P battery assembly for long-cycle backup, remote monitoring, outdoor control and OEM equipment integration.
1. Product Overview
The IFR26650LT-1S3P uses three cylindrical LiFePO4 rechargeable cells connected in parallel. The pack delivers a nominal 3.2V output, 9600mAh nominal capacity and 30.72Wh energy. Its minimum specified capacity is 9450mAh when discharged at 0.2C to 2.0V, and internal impedance is limited to 100mΩ.
LiFePO4 chemistry, long-cycle test requirements, a protected pack interface and defined low-temperature current levels make this assembly suitable for engineered systems that use controlled charging and moderate current. The finished equipment must still be validated for electrical load, charger behavior, enclosure, temperature and service conditions.
2. Core Electrical Parameters
| Parameter | Specification |
|---|---|
| Model | VTCBATT IFR26650LT-1S3P |
| Battery Type | Cylindrical LiFePO4 rechargeable battery pack |
| Configuration | 1S3P, 30.72Wh |
| Nominal Voltage | 3.2V |
| Nominal / Minimum Capacity | 9600mAh / 9450mAh |
| Charge Limits | 3.65V max; standard 1.92A; rapid 4.8A; 96mA termination |
| Discharge Limits | 4.8A max; 2.0V cut-off above -20°C; 1.5V at ≤-20°C |
| Dimensions / Weight | 28.5 × 205mm max; approx. 290g |
| Protection / Interface | HY2112-CB, DP8205 × 2, 10kΩ NTC, JST EHR-4P |
| Operating Temperature | Charge -30 to 60°C; discharge -50 to 60°C |
3. Charging and Discharging
Standard charging uses a 1.92A constant-current stage followed by constant-voltage charging at 3.65V, terminating at 96mA. Rapid charging is specified at 4.8A. Standard discharge testing uses 1.92A to a 2.0V cut-off, while the stated maximum discharge current is 4.8A. At temperatures of -20°C or below, the discharge cut-off is 1.5V and current must follow the lower temperature-dependent limit.
4. Pack Size and Structure
The three 26650-format cells are arranged as a slim 1S3P cylindrical bundle under blue shrink wrap. The four-wire harness includes a yellow NTC conductor and terminates in a JST EHR-4P connector.
Battery pack outline dimension drawing| Label / Item | Dimension | Description |
|---|---|---|
| D | 28.0mm max drawing / 28.5mm max basic specification | Pack diameter / thickness envelope |
| L | 205.0mm max | Length of three-cell bundle |
| Lead length | 180±5mm | UL3239 24AWG leads to JST EHR-4P |
5. Operating Temperature and Storage
Charging is specified from -30 to 60°C: 0.96A from -30 to -20°C, 1.92A from -20 to 0°C, and up to 4.8A above 0°C. Discharging is specified from -50 to 60°C: 0.96A from -50 to -20°C, 1.92A from above -20 to 0°C, and up to 4.8A above 0°C. Storage limits become progressively narrower for longer periods: -20 to 45°C within one month, -20 to 35°C within six months and -20 to 25°C within one year.
6. Cycle Life and Retention
At 25±2°C, the cycle-life requirement is at least 3,000 cycles to 70% of initial discharge capacity with 0.2C charge and discharge, or at least 2,000 cycles to 80% capacity with 0.5C charge and discharge. After 28 days at 25±2°C, room-temperature retention is specified at 90% or higher and recovery at 95% or higher. After 28 days at 45±2°C, retention is specified at 85% or higher and recovery at 90% or higher.
7. Protection Circuit
The integrated PCM uses a HY2112-CB protection IC and two DP8205 MOSFETs. Overcharge detection is set at 3.750±0.025V with release at 3.600±0.050V. Over-discharge detection is 2.10±0.050V with release at 2.30±0.050V. Overcurrent detection is specified at 7–12A, and external short-circuit protection releases after the short is removed. A 10kΩ ±1% B3435 NTC supports temperature sensing.
Protection application circuit8. Application Fit
The pack is a practical candidate for solar lighting controllers, remote monitoring stations, emergency lighting backup, traffic-control cabinets, industrial memory-retention modules, solar irrigation controllers, security alarm panels and low-power telecom or IoT gateways. Application engineers should verify peak load, charging profile, thermal conditions, enclosure protection and required runtime before approval.
9. OEM/ODM and Factory Supply
VTCBATT supports connector matching, lead-length changes, wire routing, NTC selection, protection-circuit adaptation, sleeve printing, labeling, sample development and batch supply. Equipment manufacturers, brand owners and distributors can submit the enclosure space, load profile, charger specification, operating temperature and target runtime for application-specific evaluation.
