ER14250 vs ER14505 Battery: Size, Voltage & Compatibility
ER14250 and ER14505 batteries are commonly used in industrial electronics, utility meters, sensors and memory-backup equipment. Both are available as 3.6V lithium-thionyl chloride (Li-SOCl₂) primary batteries.
However, they differ significantly in physical length and typical energy capacity.
In this ArcEin Battery Guide, we’ll explain the differences between ER14250 and ER14505 batteries and how to select the correct replacement for your equipment.
What Is an ER14250 Battery?
The ER14250 battery is a compact 3.6V lithium-thionyl chloride cell commonly identified as a 1/2AA battery.
Its approximate dimensions are:
- Diameter: 14.5mm
- Length: 25.4mm
- Nominal voltage: 3.6V
- Typical nominal capacity: 1200mAh
- Chemistry: Lithium Thionyl Chloride
- Rechargeable: No
The shorter 1/2AA design is useful in compatible instruments where battery compartment space is limited.
What Is an ER14505 Battery?
The ER14505 battery is a 3.6V lithium-thionyl chloride primary battery with an AA-size cylindrical format.
Its approximate dimensions are:
- Diameter: 14.5mm
- Length: 50.5mm
- Nominal voltage: 3.6V
- Typical nominal capacity: Approximately 2400–2800mAh, depending on the manufacturer and model
- Chemistry: Lithium Thionyl Chloride
- Rechargeable: No
Because it is longer than an ER14250 cell, it may provide greater energy capacity when compared under similar conditions. However, actual runtime depends on the battery model, discharge conditions and equipment requirements.
ER14250 vs ER14505: Battery Comparison
| Feature | ER14250 | ER14505 |
|---|---|---|
| Battery format | 1/2AA | AA |
| Nominal voltage | 3.6V | 3.6V |
| Battery chemistry | Li-SOCl₂ | Li-SOCl₂ |
| Diameter | Approx. 14.5mm | Approx. 14.5mm |
| Length | Approx. 25.4mm | Approx. 50.5mm |
| Typical capacity | Around 1200mAh | Around 2400–2800mAh |
| Rechargeable | No | No |
| General application | Compatible compact equipment | Compatible AA-size industrial equipment |
These specifications describe commonly available ER14250 and ER14505 cell formats. Exact specifications depend on the manufacturer and variant.
The Most Important Difference: Battery Size
Although both batteries have similar diameters, an ER14505 is approximately twice the length of an ER14250.
Consequently, they require different amounts of space inside a device.
An ER14505 battery generally cannot fit in a compartment designed for an ER14250 cell.
Likewise, an ER14250 may not make proper contact in equipment designed for an ER14505 battery.
Even when both batteries provide 3.6V, they should not be substituted without explicit manufacturer approval.
Do ER14250 and ER14505 Batteries Have the Same Voltage?
Yes. Conventional ER14250 and ER14505 Li-SOCl₂ cells have a nominal voltage of 3.6V.
However, matching voltage alone does not guarantee compatibility.
You must also check:
- Physical dimensions
- Battery chemistry
- Required discharge current
- Pulse-current requirements
- Terminal type and connector
- Battery holder configuration
- Equipment manufacturer’s instructions
Some industrial devices also require solder tabs, wire leads or specific connectors.
Which Battery Has a Higher Capacity?
The ER14505 format generally provides greater nominal capacity than the smaller ER14250 format.
For example, published industrial battery specifications commonly show ER14250 cells around 1200mAh, while ER14505 variants may range from approximately 2400mAh to 2800mAh.
However, capacity varies by manufacturer, discharge rate and temperature.
Therefore, always refer to the exact battery datasheet rather than assuming every ER14505 cell has the same capacity.
Common Applications
Both battery types may be found in compatible:
- Industrial electronic instruments
- Water and electricity meters
- Gas metering equipment
- Monitoring and telemetry systems
- Alarm and security sensors
- Memory-backup systems
- Industrial control equipment
- Low-power electronic devices
The appropriate battery depends on the equipment’s original specification.
Can You Replace ER14250 with ER14505?
No, not as a direct replacement.
The ER14505 is significantly longer than the ER14250, even though both have a nominal voltage of 3.6V.
Furthermore, equipment may have different current and terminal requirements.
Only use an alternative model when the device manufacturer explicitly confirms compatibility.
ER14505 vs Regular AA Alkaline Battery
An ER14505 may have similar dimensions to a conventional AA battery, but its electrical specifications are different.
A standard AA alkaline battery typically provides 1.5V.
In contrast, an ER14505 lithium-thionyl chloride battery provides a nominal voltage of 3.6V.
Never install a 3.6V ER14505 cell in equipment designed only for standard 1.5V AA batteries.
Doing so may damage the device or create a safety hazard.
Buy ER14505 3.6V Lithium Batteries at ArcEin
Forte ER14505 3.6V AA Lithium Battery – Pack of 1
ArcEin offers the Forte ER14505 3.6V AA-size primary lithium battery for compatible electronic and industrial equipment.
- Brand: Forte
- Model: ER14505
- Nominal voltage: 3.6V
- Battery size: AA
- Chemistry: Li-SOCl₂
- Rechargeable: No
- Pack quantity: 1
- Selling price: ₹210
Buy Forte ER14505 3.6V Lithium Battery – ₹210
For 1/2AA battery requirements, explore ArcEin’s compatible industrial battery range or contact our team with the exact model number.
Frequently Asked Questions
What is the difference between ER14250 and ER14505?
The main difference is physical size. ER14250 is approximately 25.4mm long, while ER14505 is approximately 50.5mm long. Their nominal voltage is commonly 3.6V.
Is ER14250 the same as 1/2AA?
ER14250 is commonly designated as a 1/2AA-size primary lithium cell. However, dimensions and terminal styles should always be verified.
Is ER14505 the same size as AA?
ER14505 uses an AA-size cylindrical format. Nevertheless, it is not electrically equivalent to a standard 1.5V AA alkaline battery.
Are ER14250 and ER14505 batteries rechargeable?
No. Conventional lithium-thionyl chloride ER14250 and ER14505 cells are non-rechargeable primary batteries.
Can an ER14505 battery replace an ER14250?
Not directly. Their lengths differ significantly, and replacement requires explicit equipment manufacturer approval.
Which battery lasts longer?
An ER14505 generally has a higher nominal capacity, but actual battery life depends on load current, environmental conditions, cell design and device operating patterns.
Final Recommendation
When choosing between ER14250 and ER14505 batteries, always match the exact model, voltage, size and terminal configuration specified by your equipment manufacturer.
If your device requires a 3.6V AA-size ER14505 lithium battery, ArcEin offers the Forte ER14505 in a single-cell pack.
For help identifying the correct battery, contact contactus@arcein.in with the existing battery markings and your equipment model.
Safety: Lithium-thionyl chloride batteries are non-rechargeable. Do not recharge, short-circuit, crush, puncture, dismantle, incinerate or expose them to excessive heat. Keep batteries away from children.