0.58A standard; up to 2.9A, subject to temperature limits
Pack Dimensions / Weight
20.0 × 37.5 × 68.0mm maximum; 100g
Discharge Temperature
Cold operation down to −40°C at 0.1C; temperature derating required. High-temperature use requires engineering approval; stop above 70°C cell surface temperature.
Charging Temperature
0–60°C with current derating; sub-zero charging requires engineering clarification.
Cylindrical Battery Pack Built for Temperature-Aware Equipment
VTCBATT supplies the VTC18650WT-2S1P wide temperature cylindrical Li-ion battery pack for OEM equipment that needs a compact rechargeable 7.4V power source. Two 18650 cylindrical cells form a 2S1P assembly with 2900mAh nominal capacity, 2800mAh minimum capacity and 21.46Wh nominal energy. The complete blue-wrapped battery pack measures no more than 20.0 × 37.5 × 68.0mm and weighs 100g. Standard charging and discharging use 0.58A, with 8.4V CC/CV charging and a 5.5V discharge cut-off. Maximum current is temperature-dependent rather than a constant rating across the operating range. Cold discharge down to −40°C is limited to 0.29A, while high-temperature operation requires thermal review and a stop above 70°C cell surface temperature. An S-8252AAC-M6TIU protection IC, DP8205 MOSFET, 100±3mm leads and MOLEX/5264-2P connector support equipment integration. VTCBATT offers factory supply, sample development, OEM/ODM review, custom wiring and labeling, battery wholesale and batch-production support based on an agreed technical specification.
Compact structure, controlled operating limits and OEM integration.
2S1P Cylindrical Battery Pack
Two 18650 cylindrical cells in a compact, protected 2S1P battery pack.
Wide Temperature Design with Current Derating
Cold discharge down to −40°C at 0.29A; temperature-dependent current and thermal limits apply.
7.4V 2900mAh Rechargeable Energy
7.4V nominal, 2900mAh capacity and 21.46Wh nominal energy.
Protected Pack with OEM Connection Support
Protection circuit, 100±3mm leads and MOLEX/5264-2P connector.
2S1P Cylindrical Battery Pack
Two 18650 cylindrical cells are assembled in series inside blue PVC wrapping. The finished pack supplies 7.4V nominal with 2900mAh capacity, combining the recognizable twin-cylinder structure with a compact maximum envelope of 20.0 × 37.5 × 68.0mm. Plan the compartment around the complete pack, lead exit and connector clearance.
Cold discharge operation extends down to −40°C at 0.1C (0.29A). The permitted current rises with temperature, reaching 1C (2.9A) only above 15°C through 60°C. High-temperature operation requires engineering review, and discharge must stop when cell surface temperature exceeds 70°C. Use a temperature-aware system design; sub-zero charging is not an unconditional operating feature.
The series-connected pack provides 21.46Wh nominal energy, 2900mAh nominal capacity and 2800mAh minimum capacity under the specified 0.58A discharge to 5.5V. It uses an 8.4V CC/CV charging profile. Series connection increases voltage while pack capacity remains 2900mAh; real runtime depends on load, conversion losses and temperature.
The specified protection circuit uses the S-8252AAC-M6TIU IC and DP8205 MOSFET for overcharge, overdischarge, overcurrent and short-circuit protection. The pack includes 100±3mm UL1007 24AWG leads and a MOLEX/5264-2P connector. VTCBATT can review connector matching, wiring, labeling and protection requirements for OEM/ODM supply.
Discuss your application requirements, documentation needs and sample plan with VTCBATT before batch supply.
Application Documentation Support
Request the current pack specification and discuss the test reports and certification documents required for your project. Product-specific certification availability must be confirmed during quotation.
The specified warranty period is 12 months from the date of factory delivery. Operate the pack within the agreed electrical, charging and temperature limits.
VTCBATT not only focuses on customized design and excellent service to meet the diverse demands of different customers, but also devotes itself to precise and standardized manufacturing in every process to ensure the highest-quality batteries. Meanwhile, VTCBATT will provide comprehensive support from pre-sales to after-sales, focusing on customers’ feedback to establish long-term and win-win cooperation. VTCBATT professional sales and technical engineer teams will be your best custom battery experts to assist with reliable and fast services at any time.
VTCBATT supports controlled manufacturing and battery testing through the production process. Discuss the inspection plan, pack consistency requirements and delivery documentation for your OEM project.
Applications for Wide Temperature Cylindrical Battery Packs
Potential device applications for engineering evaluation. Match voltage, current, charging temperature and enclosure protection to the pack.
Remote weather stations
Outdoor monitoring designs can use the compact 7.4V pack where seasonal temperature changes require discharge-current management.
Cold-chain data loggers
A candidate for rechargeable logging equipment in cold environments. Schedule charging in an approved temperature range and size the load for cold-current limits.
Smart agriculture nodes
The 2S1P pack supports compact agricultural electronics after enclosure, charging temperature and sleep/active current are checked.
Water-level telemetry
Use inside a sealed dry electronics compartment above the water line; select regulators and radio duty cycles for the pack voltage and available current.
Industrial handheld terminals
The 20.0 × 37.5 × 68.0mm maximum envelope and wired connector help engineers plan a rechargeable battery compartment.
Logistics asset trackers
Suitable for evaluation in rechargeable tracking designs with temperature-aware operation, controlled transmit pulses and appropriate weather protection.
Wireless security sensors
Consider for low-power outdoor sensor designs using a compatible 7.4V power path and a dry enclosure. Validate peak current at the coldest condition.
Industrial monitoring gateways
A compact cylindrical battery pack option for low-power industrial data collection and intermittent communication. Confirm system current and runtime.
Custom Wide Temperature Cylindrical Battery Packs
7.4V · 2900mAh · 2S1P. Share your device temperature, current and connector requirements with VTCBATT.
Design acceptance criteria for cycle life, capacity and retention; batch-specific results are available only when separately provided.
Cycle Life Test
Temperature Capacity Test
Rate Capability Test
Storage Retention Test
Specified cycle-life acceptance criteria under controlled room-temperature cycling. These values are requirements, not a batch test certificate.
Test condition at 25±2°C
Specified cycle-life requirement
0.2C charge / 0.2C discharge, 8.4V / 5.5V limits
≥500 cycles to 70% capacity criterion
0.5C charge / 0.5C discharge, 8.4V / 5.5V limits
≥300 cycles to 80% capacity criterion
Capacity-ratio requirements after charging at 25±2°C and discharging at 0.2C to 5.5V. No capacity percentage at −40°C is specified.
Temperature
Specified capacity ratio at 0.2C discharge
−10°C
≥70%
0°C
≥80%
25°C
≥100%
50°C
≥95%
Specified discharge-capacity ratios relative to the 0.2C reference at 25±2°C.
Discharge rate relative to 0.2C reference
Specified capacity ratio
0.2C
100%
0.5C
≥94%
1C
≥90%
Specified retention and recovery criteria after 28 days of storage, evaluated by 0.2C discharge to 5.5V.
28-day storage test
Capacity retention
Capacity recovery
25±2°C
≥90%
≥95%
45±2°C
≥85%
≥90%
Is this a cylindrical battery pack or a single cell?
It is a complete 2S1P battery pack built from two 18650 cylindrical cells connected in series, with blue wrapping, protection circuitry, leads and a connector.
Does 2S1P mean 5800mAh?
No. Connecting two 2900mAh cells in series increases nominal voltage to 7.4V while capacity remains 2900mAh. Nominal energy is 21.46Wh.
What current is available at −40°C?
The specified discharge maximum is 0.1C, or 0.29A, from −40°C through −20°C. Usable capacity at −40°C is not specified and must be evaluated in the actual device.
Can the pack run continuously at 85°C?
Do not treat 85°C as an unconditional operating rating. The high-temperature current table needs application-specific engineering approval, and discharge must stop when cell surface temperature exceeds 70°C. Confirm any use above 60°C before deployment.
Can the battery charge below 0°C?
For the default design, do not charge below 0°C. A sub-zero charge profile requires written engineering clarification. Above 0°C, apply the temperature-dependent current limits shown in the charging table.
Which charger and protection circuit should the device use?
Use a compatible 2S lithium-ion CC/CV charger with an 8.4V limit and temperature-aware current control. Agree the charge-termination current during engineering review. The installed protection circuit is a backup safeguard; normal discharge should stop at 5.5V.
Is an NTC or cell balancing included?
An NTC is not specified for the standard two-wire pack, and cell balancing values are not provided. Review external temperature sensing or a customized protection design for the equipment.
Can VTCBATT customize the connector and supply bulk orders?
VTCBATT can review wiring, connector, labeling, protection and sampling requirements for OEM/ODM projects and wholesale supply. The specified warranty is 12 months from factory delivery; project-specific documentation and certification needs should be confirmed during quotation.
Engineering Details for the 7.4V 2900mAh Cylindrical Battery Pack
The VTC18650WT-2S1P combines two cylindrical 18650 cells, a protection circuit and a wired connector in one rechargeable battery pack. Its wide-temperature design is intended for equipment with temperature-aware power control. Evaluate both the environmental range and the available current at each operating temperature.
VTC18650WT-2S1P 7.4V 2900mAh Wide Temperature Cylindrical Li-ion Battery Pack
0.58A standard; up to 2.9A, subject to temperature limits
Pack Dimensions / Weight
20.0 × 37.5 × 68.0mm maximum; 100g
Discharge Temperature
Cold operation down to −40°C at 0.1C; temperature derating required. High-temperature use requires engineering approval; stop above 70°C cell surface temperature.
Charging Temperature
0–60°C with current derating; sub-zero charging requires engineering clarification.
The two cylindrical cells sit side by side inside blue PVC wrapping. Their 2S1P electrical connection provides 7.4V nominal and 2900mAh nominal capacity. The pack envelope includes the assembled cells and protection components; allow additional room for the lead exit, cable bend and connector. Internal impedance is specified at no more than 180mΩ.
Drawing label
Description
Dimension / specification
T
Maximum pack thickness
20.0mm
W
Maximum pack width
37.5mm
H
Maximum pack height
68.0mm
L
Lead length
100±3mm
Wire
Lead construction
UL1007 24AWG, red / black
CONN
Connector
MOLEX/5264-2P
Cylindrical battery pack outline and connector dimensions
Wide Temperature Discharge: Match Current to Conditions
Cell temperature T
Maximum discharge rate
Maximum current
−40°C ≤ T ≤ −20°C
0.1C
0.29A
−20°C < T ≤ 0°C
0.2C
0.58A
0°C < T ≤ 15°C
0.5C
1.45A
15°C < T ≤ 60°C
1C
2.9A
60°C < T ≤ 85°C
0.5C listed; engineering confirmation required
1.45A listed; do not operate beyond approved thermal limits
Thermal operating boundary: the high-temperature current band is conditional and must not be read as an unrestricted 85°C pack rating. Stop discharging if cell surface temperature exceeds 70°C. Operation above 60°C requires an approved application-specific thermal specification before use.
Charging Profile and Temperature Limits
Cell temperature T
Maximum charge rate
Maximum current
0°C
0.1C
0.29A
0°C < T ≤ 15°C
0.2C
0.58A
15°C < T ≤ 35°C
1C
2.9A
35°C < T ≤ 60°C
0.5C
1.45A
For the default integration plan, do not charge below 0°C. Sub-zero charging requires written engineering clarification of the low-temperature charging conditions. Standard CC/CV charging is 0.58A to 8.4V. Charge-termination current must be agreed for the final charger profile before production.
Protection Circuit and System Integration
Parameter
Specification
Protection IC / MOSFET
S-8252AAC-M6TIU / DP8205
Overcharge detection
4.300±0.025V per cell; 0.50–1.50s delay
Overcharge release
4.100±0.050V per cell
Overdischarge detection
2.40±0.080V per cell; 50–150ms delay
Overdischarge release
3.00±0.100V per cell
Overcurrent detection
4.5±1.5A; 5–15ms delay
Short-circuit detection delay
100–600µs
Main circuit resistance
≤50mΩ at VC = 8.4V
Normal current consumption
3.5µA typical; 8µA maximum
The protection thresholds are backup limits and do not replace the normal 8.4V charge and 5.5V pack discharge controls. Overcurrent protection at 4.5±1.5A does not make this a 4.5A continuous-discharge pack. No balancing function or installed NTC is specified; provide an appropriate system temperature-monitoring strategy.
2S battery pack protection circuit
Cycle Life and Capacity Requirements
Test condition at 25±2°C
Specified cycle-life requirement
0.2C charge / 0.2C discharge, 8.4V / 5.5V limits
≥500 cycles to 70% capacity criterion
0.5C charge / 0.5C discharge, 8.4V / 5.5V limits
≥300 cycles to 80% capacity criterion
Temperature
Specified capacity ratio at 0.2C discharge
−10°C
≥70%
0°C
≥80%
25°C
≥100%
50°C
≥95%
Cycle life and capacity vary with temperature, current and operating history. The values above are specified acceptance requirements, not a claim that every application delivers the same runtime or cycle count.
Storage and Charge Retention
28-day storage test
Capacity retention
Capacity recovery
25±2°C
≥90%
≥95%
45±2°C
≥85%
≥90%
Storage duration
Specified temperature range
Within one month
−20 to 50°C
Within six months
−20 to 45°C
Within one year
−20 to 25°C
Application Fit and Selection Comparison
Selection factor
This 2S1P pack
What to check in the device
Cell vs pack
Two cells with wiring and protection
Use the complete pack envelope, not a single 18650 holder dimension
Electrical interface
7.4V nominal, 8.4V charge limit
Input regulation and 5.5V discharge cut-off
Cold operation
0.29A maximum at −40 to −20°C
Active current, radio pulses and measured cold runtime
Potential applications for this cylindrical lithium-ion battery pack include remote weather stations, cold-chain data loggers, smart agriculture monitoring nodes, water-level telemetry, industrial handheld terminals, logistics trackers, outdoor wireless security sensors and low-power industrial gateways. These devices can benefit from a compact 2S1P pack and temperature-aware rechargeable power design, provided their input voltage, active current, radio pulses, charging conditions and enclosure protection are checked against the battery limits. At −40°C, design the load around the 0.29A maximum discharge current and validate usable capacity; 2900mAh is not a guaranteed cold-temperature capacity. VTCBATT works with equipment manufacturers, distributors and brand owners on connector matching, lead length, protective circuitry, labeling and sample evaluation before factory-direct wholesale and batch supply. Optional temperature-sensing requirements should be reviewed as a custom design; an installed NTC is not specified for the standard two-wire pack.
Remote weather station application conceptCold-chain logger application concept
OEM/ODM Cylindrical Battery Pack Supply
Share the equipment voltage window, continuous and peak current, lowest and highest cell temperatures, available battery space, connector pinout, target quantity and required documentation. VTCBATT can review the pack configuration, sampling plan and factory supply proposal. Warranty: 12 months from the date of factory delivery.
Explore Wide Temperature Battery options or request the current datasheet and an approved operating profile for your application.
Looking for the perfect battery solution? Our expert engineering team is ready to support you from idea to delivery. Whether you need custom voltage, size, or application-specific design, we’re here to make it happen. Get in touch today and let us power your success—one battery at a time!
