Custom Data Logger Battery
A data logger must keep recording until the monitoring task is complete. If battery voltage drops too early, the device may stop logging and the recorded data may be incomplete.
This is especially important for temperature loggers, cold-chain recorders, transport loggers, and industrial data logging devices. These products may operate for days, months, or even years before the data is retrieved.
Choosing a data logger battery should therefore be based on the real operating profile of the logger. Key factors include standby current, logging interval, measurement current, memory-write load, total recording duration, storage time before activation, temperature exposure, and wireless upload current.
Low temperature can reduce usable capacity and increase voltage drop. Frequent logging or wireless transmission can also increase energy consumption. For this reason, battery capacity alone is not enough to determine whether a battery is suitable.
VTCBATT provides primary lithium cells and custom rechargeable battery packs for data logger applications. Custom battery solutions can be designed and tested according to the required voltage, load profile, operating temperature, available space, and target recording duration.
Battery Options for Data Loggers
Select chemistry according to duration, temperature, pulse load and reuse requirements.
3V Li-MnO₂ cells are suitable for many compact temperature loggers, transport recorders and disposable monitoring devices.
They provide a practical combination of compact size, shelf life and pulse capability for devices that periodically wake and record data.
Best suited for: compact and disposable loggers.
Li-SOCl₂ batteries are suitable for long-duration industrial and environmental data logging systems where very low self-discharge and long service life are important.
Pulse requirements should also be evaluated when the logger includes wireless communication.
Best suited for: multi-year and unattended logging.
Rechargeable lithium batteries are suitable for reusable loggers that are regularly charged between deployments.
LiPo batteries are particularly useful where the enclosure requires a thin or customized battery shape.
Best suited for: reusable and rechargeable data loggers.
Special battery designs can be considered for loggers used in freezers, refrigerated transportation, outdoor environments and industrial temperature conditions.
Battery performance should be verified according to the actual load, temperature and recording duration.
Best suited for: cold-chain and harsh-environment logging.
Match the Battery to the Data Logger
| Data Logger Type | Typical Power Profile | Main Battery Requirement | Battery Direction |
|---|---|---|---|
| Temperature Data Logger | Long standby + periodic measurement | Long recording duration and compact size | Li-MnO₂ / Li-SOCl₂ |
| Cold-Chain Logger | Periodic logging under low temperature | Low-temperature performance and stable voltage | Li-MnO₂ / Wide-Temperature Lithium |
| Disposable Shipment Logger | Storage + activation + fixed shipment period | Long shelf life and reliable mission duration | Primary Lithium |
| Reusable Data Logger | Repeated recording and data download cycles | Rechargeability and cycle life | LiPo / Li-ion |
| Wireless Data Logger | Logging + periodic BLE/LoRa/cellular upload | Standby efficiency plus transmission pulse capability | Li-MnO₂ / Li-SOCl₂ with pulse support / Li-ion / LiPo |
| Industrial Data Logger | Long deployment in industrial environments | Long life and wide-temperature operation | Li-SOCl₂ / Custom Lithium Pack |
Batteries for Cold-Chain and Temperature Data Loggers
Cold-chain data loggers introduce an additional challenge: battery performance changes with temperature.
A logger may move through several environments during one shipment:
Warehouse → Refrigerated Transport → Cold Storage → Distribution → Final Delivery
The battery may therefore experience changing temperatures rather than one constant laboratory condition.
Important design parameters include:
- minimum exposure temperature;
- duration at low temperature;
- logging interval;
- current required for each measurement;
- total shipment duration;
- minimum logger operating voltage;
- storage period before activation.
Battery performance at low temperature should be validated using the actual logger load and required recording duration, rather than relying only on the battery’s stated temperature range.
Batteries for Cold-Chain and Temperature Data Loggers
Custom battery solutions for real-world monitoring from warehouse departure to final delivery.
Temperature monitoring through refrigerated transport and distribution.
Long shelf life and reliable activation after storage before use.
Long-duration logging for unattended industrial and environmental equipment.
Battery systems evaluated for BLE, LoRa, NB-IoT or cellular transmission pulses.
OEM / ODM engineering
Custom Data Logger Battery Solutions
The battery can be configured around both the electrical design and the available battery compartment.
Customization options include:
- primary lithium cells with solder tabs;
- coin cell holder configurations;
- compact LiPo battery packs;
- cylindrical lithium battery packs;
- wire length and wire gauge;
- JST and other connector options;
- NTC and protection circuits where required;
- insulation and enclosure configuration;
- custom battery labels;
- wide-temperature battery options.
For new data logger projects, sample batteries can also be evaluated under the expected logging interval, load profile and temperature conditions before production.
Battery Requirements for Data Logging Devices
Unlike many connected devices, a data logger must maintain reliable power throughout a defined recording task.
For a cold-chain shipment, this may mean recording temperature every few minutes from warehouse departure until final delivery. An industrial logger may collect measurements for months before the data is retrieved. Other devices may remain in storage for a long period before they are activated.
The battery therefore needs to support the complete logging mission, rather than simply meet the nominal voltage and capacity of the device.
Important operating stages include:
Storage Before Use → Activation → Periodic Logging → Data Storage → Optional Upload → Data Retrieval
Battery capacity and voltage performance should be evaluated across the entire sequence.
Battery Reliability and Data Integrity
For data logging applications, battery reliability is directly related to record completeness.
If battery voltage falls below the logger’s minimum operating voltage before the recording task is complete, measurements may stop even though unused battery capacity remains.
For cold-chain and transport monitoring, incomplete records can create gaps in the temperature history of a shipment. For industrial or environmental monitoring, a premature shutdown may result in missing measurement periods before the logger can be serviced or retrieved.
Battery evaluation should therefore consider:
- minimum device operating voltage;
- battery voltage under the actual load;
- temperature-related voltage drop;
- usable capacity at the required temperature;
- total recording duration;
- safety margin for unexpected delays.
The goal is not simply to maximize battery capacity. The battery should maintain usable power until the required recording mission is complete.
Data Logger Battery Engineering Checklist
To evaluate a battery for your data logger, provide:
- Logger type
- Required operating voltage
- Minimum operating voltage
- Standby current
- Measurement current and duration
- Memory-write current if known
- Logging interval
- Wireless upload current if applicable
- Upload duration and frequency
- Required recording duration
- Storage time before activation
- Operating temperature range
- Battery compartment dimensions
- Disposable or rechargeable design
- Wire, tab or connector requirement
- Estimated annual quantity
- Certification or transport-document requirements
How Logging Interval Changes Battery Life
A data logger does not normally draw the same current continuously.
Its power consumption may consist of several operating states:
Sleep → Wake Up → Sensor Measurement → Memory Write → Sleep
A wireless logger may add another event:
Sleep → Measurement → Memory Write → Wireless Upload → Sleep
For example, a logger recording once every minute performs far more measurement and memory-write events during a 30-day shipment than a logger recording once every 30 minutes.
This is why battery selection should be based on the actual logging interval and current profile, rather than battery capacity alone.
Information Needed for Power Evaluation
| Parameter | What to Provide |
|---|---|
| Standby Current | Current while the logger is sleeping |
| Measurement Current | Current while sensors are active |
| Measurement Duration | How long each measurement takes |
| Logging Interval | Every 10 sec, 1 min, 5 min, 30 min, etc. |
| Memory Write Current | Current required to save each record |
| Upload Current | BLE, LoRa, NB-IoT or cellular current if applicable |
| Upload Frequency | Every record, hourly, daily or at retrieval |
| Recording Duration | Days, months or years |
| Temperature Range | Minimum and maximum operating temperature |
| Storage Before Use | Expected warehouse/storage period before activation |
Data Logger Battery Validation Example
Application: Cold-chain temperature data logger
Test Goal: Verify whether the selected battery can support the full logging mission at low temperature without the voltage dropping below the logger’s minimum operating requirement.
| Test Item | Example Condition |
|---|---|
| Battery | ER14250 3.6V Li-SOCl₂ |
| Logger Type | Temperature data logger |
| Standby Current | 8 µA |
| Logging Interval | Every 5 minutes |
| Measurement Current | 4 mA |
| Measurement Duration | 1 second per logging event |
| Memory Write Current | 6 mA |
| Memory Write Duration | 50 ms per event |
| Wireless Upload | None / optional, depending on logger design |
| Test Temperature | -20°C |
| Required Recording Period | 30 days |
| Logger Minimum Operating Voltage | 2.7V |
| Initial Battery Voltage | 3.65V |
| Validation Method | Continuous logging under the defined load profile and temperature condition |
| Result | Logging completed for the required test period |
| Lowest Recorded Voltage | 3.05V under active load |
| Final Result | Battery voltage remained above the 2.7V system limit during the full test |
Test Conclusion
The battery completed the required 30-day logging period at -20°C without dropping below the logger’s minimum operating voltage. No interruption of the recording cycle was observed during the test.
This result applies only to the tested battery model, logger load, logging interval, temperature, and recording duration. A different current profile or lower temperature may produce a different result.
Data loggers commonly use Li-MnO₂, Li-SOCl₂, Li-ion, or LiPo batteries.
Li-MnO₂ batteries are often used in compact temperature and transport loggers. Li-SOCl₂ batteries are suitable for long-duration, low-power data loggers. Li-ion and LiPo batteries are more common in reusable or rechargeable logging devices.
The best battery depends on the logger’s operating voltage, logging interval, standby current, recording duration, temperature range, available space, and whether the device is disposable or rechargeable.
Temperature data loggers commonly use Li-MnO₂, Li-SOCl₂, Li-ion, or LiPo batteries. The best choice depends on the required recording duration, operating temperature, logging interval, device size, and whether the logger is disposable or rechargeable.
Li-MnO₂ batteries are commonly used in compact temperature and cold-chain loggers. They provide good shelf life, stable voltage, and suitable performance for periodic low-power recording.
Li-SOCl₂ batteries are well suited to long-duration industrial and environmental loggers because of their very low self-discharge and wide operating-temperature capability. Wireless versions may require additional pulse-current support.
Li-ion and LiPo batteries are typically used in reusable temperature loggers that can be recharged between deployments. LiPo is especially useful when a thin or customized battery shape is required.
For cold-chain or low-temperature applications, battery selection should consider the minimum temperature, time at low temperature, logging interval, load current, total recording duration, and minimum operating voltage of the logger. Performance should be verified under the actual load and temperature conditions.
Data logger battery life can range from weeks to several years. It depends on battery chemistry, capacity, standby current, logging interval, sensor load, wireless communication, temperature and minimum device voltage.
A logger that records every few seconds will normally consume more energy than the same device recording every 15 or 30 minutes. Wireless uploads can further increase power consumption.
For accurate battery-life estimation, calculate energy use across the complete recording cycle and verify the result under the expected operating temperature and load.
The minimum temperature, time spent at low temperature, logging interval, total shipment duration and minimum operating voltage of the logger should all be considered. Low-temperature battery performance should be tested under the actual logger load whenever possible.
Yes. A shorter logging interval causes the sensor and memory circuit to activate more frequently, increasing total energy consumption. Wireless loggers may consume additional energy when recorded data is transmitted.
Yes. If battery voltage falls below the logger’s operating requirement before the monitoring period ends, logging may stop and the recorded dataset may be incomplete.
Estimate battery capacity from the logger’s actual operating cycle. Include the power used during sleep, sensor measurement, memory writing, and wireless transmission.
A simple calculation is:
A shorter logging interval means more measurement and memory-write events, so battery consumption increases.
The calculated value should then be adjusted for temperature, self-discharge, battery aging, system cut-off voltage, and engineering margin. Rated battery capacity is not always fully usable.
For wireless data loggers, peak current must also be checked. The battery voltage should remain above the logger’s minimum operating voltage during transmission or other high-load events.
Primary lithium batteries are commonly used in disposable shipment data loggers. These devices may stay in storage for months before activation. After activation, the battery only needs to support one defined monitoring period.
Battery selection should consider shelf life, shipment duration, logging interval, and temperature exposure.
Yes. Battery chemistry, dimensions, capacity, tabs, wires, connectors, protection and labels can be configured around the electrical and mechanical requirements of the logger.
