HL18650T High Temperature Lithium Battery Cell
High temperature 18650 lithium battery cell for long-term backup applications, featuring −40°C to +85°C operation, low self-discharge, stable float charging and up to 5 years of reliable service life.
HL18650T 18650 Battery Cell
HL18650T-High Temperature 18650 Cell Specifications
Key specifications, temperature performance and mechanical dimensions for the HL18650T 2000mAh high-temperature 18650 lithium-ion battery cell.
−40°C to +85°C
Operating Temperature
2000mAh
Typical Capacity
10A
Max Continuous Discharge
≈60%
Capacity Retention at −40°C
>90%
80°C Aging
Electrical Specifications
Typical Capacity (0.2C)
2000mAh
Minimum Capacity (0.2C)
1950mAh
Nominal Voltage
3.6V
Working Voltage
2.75V – 4.20V
Max Charge Current
1.95A
Max Continuous Discharge
10A
Temperature & Reliability Specifications
Charge Temperature
−20°C to +60°C
Discharge Temperature
−40°C to +85°C
Cycle Life
> 300 cycles
Capacity at −40°C (0.2C)
≈ 60%
Recovery After 1000h at 80°C
> 90%
Mechanical Specifications
Diameter
18.25 ± 0.2 mm
Height
64.95 ± 0.2 mm
Cell Format
18650
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Why Choose HL18650T for Backup Power?
HL18650T is designed for automotive electronics, industrial equipment and outdoor systems requiring reliable long-term standby power under extreme temperature conditions.
Wide-Temperature Operation
Reliable operation across −40°C to +85°C environments.
High-Temperature Reliability
Designed for long-term performance under elevated temperature conditions.
Long-Term Standby Stability
Provides reliable backup power for systems requiring extended standby operation.
Float Charge Stability
Stable performance under long-term continuous charging conditions.
5+ Years Long-Term Reliability
Designed for long-term deployment with stable performance in demanding environments.
Automotive-Grade Reliability
Manufactured under IATF16949 quality management standards for automotive applications.
HL18650T High Temperature Battery Performance
Validated performance data covering wide-temperature discharge, high-temperature aging, cycle life and discharge capability.
Wide Temperature Discharge Performance
Stable discharge performance from −40°C to +85°C for extreme-environment backup applications.
Capacity Recovery After 80°C High Temperature Aging
After 80°C aging, HL18650T recovers over 90% capacity, ensuring reliable high-temperature storage performance.
Low-Temperature Discharge Performance After 80°C Aging
After long-term 80°C aging, HL18650T maintains reliable 6W discharge performance at −30°C.
High-Temperature Cycle Performance at 60°C
HL18650T maintains approximately 84% capacity retention after 300 cycles at 60°C.
Room-Temperature Cycle Performance
HL18650T retains approximately 95% capacity after 500 room-temperature cycles.
Discharge Rate Capability
Stable voltage output across discharge rates from 0.2C to 5C.
HL18650T Applications for Extreme Environments
Reliable backup power for automotive electronics, GPS trackers, security equipment and industrial devices requiring long-term standby operation in high-temperature, low-temperature and harsh environments.
T-Box Battery
Challenges
-
High vehicle temperatures accelerate battery aging
-
Long standby periods require reliable backup power
-
Vibration and temperature fluctuations affect power stability
UltraXel Solution
-
Reliable operation from −40°C to +85°C
-
>90% capacity recovery after 80°C aging
-
Vibration-resistant performance for reliable T-Box communication
eCall Battery
Challenges
-
Long standby periods require reliable backup power
-
Extreme temperatures affect battery performance
-
Vehicle heat accelerates battery aging
UltraXel Solution
-
Stable power after long-term standby
-
−40°C to +85°C wide-temperature operation
-
High-temperature aging resistance for long service life
GPS Tracking Battery
Challenges
-
Vehicle temperature changes affect battery performance
-
Power interruption requires reliable backup recording
-
Limited installation space requires compact battery design
UltraXel Solution
-
Stable backup power for continuous recording
-
Wide-temperature operation from −40°C to +85°C
-
Compact 18650 cell design for space-limited devices
Dash Cam Backup Battery
Challenges
-
Stable output under varied vehicle temperature environments
-
Sufficient power for emergency recording after power cut-off
-
Compact size to fit limited installation space
UltraXel Solution
-
Works stably from -40°C to +85°C
-
High capacity ensures continuous emergency recording
-
Miniature design adapts to narrow installation spaces
Outdoor Security Battery
Challenges
-
Outdoor exposure causes high temperature fluctuations
-
24/7 operation increases battery aging stress
-
Remote installation makes maintenance difficult
UltraXel Solution
-
Reliable operation under harsh outdoor conditions
-
High-temperature aging resistance for long-term reliability
-
Stable power supply with reduced maintenance requirements
Roadside Monitoring Equipment Battery
Challenges
-
Outdoor exposure causes temperature fluctuations
-
Remote deployment requires low maintenance
-
Long-term monitoring needs reliable standby power
UltraXel Solution
-
Wide-temperature operation from −40°C to +85°C
-
>90% capacity recovery after 80°C aging
-
Reliable standby power for continuous monitoring
Logistics & Container Tracking Backup Battery
Challenges
-
Transportation environments cause temperature variations
-
Long-term tracking requires stable standby power
-
Remote deployment makes battery replacement difficult
UltraXel Solution
-
Reliable operation from −40°C to +85°C
-
6W discharge capability at −30°C after aging
-
Long-term reliability for continuous tracking
Custom High-Temperature Battery Packs
UltraXel provides custom battery packs using HL18650T cells, engineered for reliable performance in high-temperature environments.
Cell Configuration
Custom voltage and capacity.
BMS / PCM Protection
Integrated safety protection.
NTC Monitoring
Accurate temperature sensing.
Connectors & Wiring
Custom cables and connectors.
Housing Design
Heat-resistant pack structures.
OEM Integration
Design, testing and integration.
From Cell Selection to Custom Battery Pack
Custom battery packs engineered around your device requirements.
01
Cell Selection
NCM / LiFePO₄
→
02
Pack Configuration
Voltage · Capacity
→
03
Protection
PCM / BMS · NTC
→
04
Wiring
Connectors · Cables
→
05
Mechanical Structure
Size · Structure
→
06
Charging Match
Grid · Solar · USB / DC
Typical High-Temperature Battery Pack Projects
Proven battery solutions for demanding environments and critical applications.
IoT Battery Pack
Custom 18650T battery pack for outdoor gateways and industrial IoT devices.
Temperature:
−40°C to +85°C
Configuration:
HL18650T / 1S2P
Voltage / Capacity:
3.6V / 4Ah
Max Discharge:
11A
Automotive T-Box & eCall Battery
Backup power for automotive telematics and emergency call systems.
Temperature:
−40°C to +85°C
Configuration:
HL18650T / 1S2P
Voltage / Capacity:
3.6V / 4Ah
Max Discharge:
11A
Fleet Dash Camera Battery Pack
Stable backup power for fleet monitoring and recording devices.
Temperature:
−40°C to +85°C
Configuration:
HL18650T / 2S1P
Voltage / Capacity:
7.2V / 2Ah
Max Discharge:
3A
Dash Camera Battery Pack
Reliable backup power for emergency recording and parking monitoring.
Temperature:
−40°C to +85°C
Configuration:
HL18650T / 1S1P
Voltage / Capacity:
3.6V / 2Ah
Max Discharge:
5.5A
Why Backup Batteries Fail in Harsh Environments
HL18650T high temperature battery cell is engineered for automotive-grade standby power, high-temperature storage, and reliable emergency output in eCall, T-Box, GPS tracking, and outdoor electronics.
Failure Factor
HL18650T Wide-Temp Battery Advantage
Risk in Backup Applications
High-Temperature Storage
>90% recovery after 1000h at 80°C for high-temperature storage reliability.
Hot cabins and outdoor enclosures accelerate battery aging and reduce backup reliability.
Long-Term Standby
Ultra-low self-discharge helps maintain usable power over long standby periods.
Batteries may remain inactive for years, increasing the risk of voltage drop or startup failure.
Float Charging Stress
Float charge stability supports reliable standby performance.
Long-term online charging can affect battery stability and service life.
Emergency Wake-Up Load
10A max discharge supports startup, communication wake-up, and emergency output.
eCall, T-Box, GPS, and communication devices need instant current when activated.
Ni-MH Replacement for Automotive Backup
HL18650T enables higher voltage integration, fewer cells and reliable backup performance for demanding automotive applications.
| Evaluation Point | Automotive Ni-MH | UltraXel HL18650T | Replacement Consideration |
|---|---|---|---|
| Cell Voltage | 1.2V per cell | 3.6V per cell | Fewer cells may be required to achieve the same system voltage |
| Pack Configuration | Multiple cells required for voltage matching | 18650 cell-based customized pack | Evaluate pack size, connector and installation space |
| Temperature Reliability | Limited performance under prolonged high-temperature standby | Designed for −40°C to +85°C operation | Compare standby requirements under actual vehicle conditions |
| High-Temperature Aging | Faster degradation under elevated temperatures | >90% capacity recovery after 80°C aging test | Validate long-term standby reliability |
| Backup Power Performance | Depends on Ni-MH cell and pack design | Stable backup power performance for emergency loads | Check wake-up current and system voltage requirements |
Evaluating a Ni-MH replacement?
Share your voltage, charging method, emergency load and installation space for an assessment.
Evaluate Your Ni-MH Replacement
Share your voltage, charging method, emergency load and installation space for an assessment.
Discuss Your Battery Project With UltraXel
Share your project requirements and get technical support, datasheets and customized solutions.
How We Support Your Project
Technical Evaluation
Application review and battery selection.
Datasheet & Sample
Technical documents and samples for validation.
Custom Battery Solutions
Cell selection, BMS and pack integration.
Engineering Support
From prototype evaluation to production.
Project Information
Application · Voltage · Capacity · Temperature · Annual Volume
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HL18650T Wide-Temp Cell Validated for Long-Term Reliability
HL18650T high temperature lithium-ion battery performance is supported by high-temperature aging, float charge, self-discharge, and rate discharge tests. These curves help engineers evaluate long-term voltage retention, recoverable capacity, and emergency power output before pack design.
Why Choose HL18650T Over Ni-MH Batteries?
Compared with traditional Ni-MH batteries, UltraXel HL18650T wide temperature battery offers higher energy density, lower self-discharge, wider temperature performance, and stronger long-term standby reliability for automotive and outdoor backup power applications.
Parameter
UltraXel HL18650T Wide Temperature Battery
Ni-MH Battery
Nominal Voltage
3.6V
1.2V
Energy Density
150–250 Wh/kg
60–120 Wh/kg
Self-Discharge Rate
Low self-discharge; suitable for 1–2 years standby
High, around 20–30% monthly loss; requires frequent charging
Memory Effect
No memory effect
Requires full discharge to reduce memory effect
Low-Temperature Performance
Supports -40°C 1C discharge
Difficult to support high-rate discharge below -30°C
High-Temperature Performance
Can be stored at 80°C for over 40 days
Significant capacity loss at 60°C
Overall Cost
Higher energy density and longer service reliability help reduce total cost
Higher total system cost
Cycle Life
500–1000 cycles
500–1000 cycles
Charging Time
Supports fast charging
Long charging time
Environmental Friendliness
Environmentally friendly, no heavy metal pollution
Relatively good
Advantages of 18650T Wide Temperature Battery
- Wide-temperature operation: Stable performance from -40°C to +85°C
- Automotive standby reliability: Designed for T-Box, eCall, and in-vehicle backup power
- Low self-discharge: Suitable for long standby and infrequent maintenance applications
- Higher energy density: Helps reduce battery pack size and improve runtime
- High-temperature aging resistance: Built for hot cabin, outdoor enclosure, and harsh field environments
- Cell + pack support: UltraXel provides wide-temperature cells and customized battery pack solutions
HL18650T Wide Temperature Battery Specifications
HL18650T is a heat-resistant 18650 lithium battery designed for high-temperature environments, delivering stable performance from -40°C to +85°C.
Key Performance Highlights
-40°C to +85°C
Operating Temperature
2000mAh
Typical Capacity
10A
Max Continuous Discharge
≈ 60%
Capacity Retention at -40°C
> 90%
Recovery Capacity After 1000h @ 85°C Aging
Electrical Specifications
Parameter
Specification
Typical Capacity (0.2C)
2000mAh
Minimum Capacity (0.2C)
1950mAh
Nominal Voltage
3.60V
Working Voltage
2.75V – 4.20V
Max Charge Current
1.95A
Max Continuous Discharge Current
10A
Charge Temperature
-20°C ~ +60°C
Discharge Temperature
-40°C ~ +85°C
Reliability Performance
Parameter
Specification
Cycle Life
> 300 cycles
-40°C Capacity Retention (0.2C)
≈ 60%
Recovery Capacity After 1000h @ 85°C Aging
> 90%
Mechanical Specifications
Parameter
Specification
Diameter
18.25 ± 0.2 mm
Height
64.95 ± 0.2 mm
FAQ About high temperature lithium battery
What is a high temperature battery?
A high temperature battery is designed to operate reliably in elevated-temperature environments where standard batteries may age faster, lose capacity, or become unstable.
UltraXel HL18650T is a high temperature 18650 lithium ion battery with stable discharge performance from -40°C to +85°C, suitable for automotive electronics, GPS tracking, outdoor monitoring, and field devices.
What is the best battery for extreme heat?
For extreme heat, the best battery should offer heat-resistant materials, stable high-temperature aging performance, and reliable output after long-term exposure to elevated temperatures.
HL18650T high temperature battery is designed for high temperature environments, retaining over 90% recovery capacity after 1000h aging at 80°C.
Can batteries catch fire if they get too hot?
Yes, overheating can increase safety risks for batteries, especially if the cell is not designed for high-temperature environments or is used beyond its rated limits.
That is why high-temperature applications should use properly rated heat-resistant lithium batteries with suitable protection design, BMS, and thermal management.
Is it okay to store batteries in a hot garage?
Long-term storage in a hot garage is not recommended for standard batteries because heat can accelerate aging and reduce performance. But our HL18650T can be a perfect fit.
For applications that must operate or stand by in hot environments, a high temperature battery like HL18650T offers better aging resistance and reliability than standard 18650 cells.
Why is HL18650T suitable for T-Box backup power?
T-Box batteries need to handle high cabin temperatures, vibration, long standby time, and stable communication power. HL18650T high temperature lithium-ion battery supports -40°C to +85°C operation and high-temperature aging resistance, helping maintain reliable backup power for vehicle connectivity systems.
Can HL18650T be used in eCall backup batteries?
Yes. eCall systems require instant power output after long-term standby, even under low temperature or high cabin heat. HL18650T high temp battery cell provides stable discharge performance from -40°C to +85°C and supports reliable emergency activation for automotive backup power.
Is HL18650T suitable for GPS tracking devices?
Yes. GPS tracking devices may face high daytime heat, low nighttime temperatures, and long unattended deployment. HL18650T offers wide-temperature performance and stable discharge capability to support continuous tracking and reliable data transmission.
Why choose HL18650T for dash cam batteries?
Dash cam batteries need stable output in varied vehicle temperatures and enough power for emergency recording after power cut-off. HL18650T works from -40°C to +85°C and provides reliable backup power for in-vehicle recording devices.
Can HL18650T support outdoor security equipment?
Yes. Outdoor security equipment can experience high internal enclosure temperatures from sunlight and continuous 24/7 operation. HL18650T supports stable high-temperature discharge conditions and helps reduce maintenance frequency for remote surveillance installations.
Is HL18650T suitable for roadside monitoring equipment?
Yes. Roadside monitoring equipment often faces extreme temperature changes, long standby demand, and costly maintenance. HL18650T high temperature lithium-ion battery provides stable operation from -40°C to +85°C and supports long-term monitoring in harsh outdoor environments.
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