Ultralife High Energy Lithium Battery UHE-ER14250-H 3.6V 1.2Ah (1/2 AA Bobbin)
Product information
The Ultralife UHE-ER14250-H is a compact primary lithium battery in the 1/2 AA format (half AA size). It belongs to the "High Energy" series and uses bobbin technology for maximum energy density in the smallest space. With a voltage of 3.6 V and a capacity of 1.2 Ah, it is the global standard for memory backup on computer motherboards and in industrial control systems. It offers an extremely long service life and high reliability at low discharge currents.
Highlights at a glance
- Compact 1/2 AA format: At just 25 mm high, it is exactly half the length of a standard AA battery, with the same diameter (14.5 mm).
- High energy density: Despite its small size, it delivers a capacity of 1.2 Ah, which is sufficient for years of operation in backup applications.
- Bobbin technology: The internal design is optimised for low self-discharge (< 2 % per year), ideal for devices that are permanently connected to the mains and only require backup in the event of a power cut.
- Constant 3.6V voltage: Provides a stable voltage level that is significantly higher than that of alkaline (1.5V) or lithium-manganese batteries (3.0V).
- Extreme temperature range: Operates reliably between -55 °C and +85 °C, making it suitable for use in outdoor sensors or heated control cabinets.
- Long service life: Designed for a service life of up to 10 years in low-power applications.
The standard for motherboards & dive computers
The UHE-ER14250-H (often also referred to as LS14250 by Saft or SL-750 by Tadiran) is the classic "BIOS battery" for industrial computer motherboards, older Apple Macintosh models (G3/G4/G5) and PLC controls (Siemens S5/S7 backup). In addition, this format is frequently used in professional dive computers, dog collars (for tracking) and alarm system sensors used.
Features
| Model | Ultralife UHE-ER14250-H (High Energy 1/2 AA) |
| Application | CMOS backup (Mac/PC), dive computers, sensors |
| Technology | Lithium-thionyl chloride (Li-SOCl2) - Bobbin Construction |
| Voltage | 3.6 V |
| Capacity | 1.2 Ah (Nominal) - High energy density |
| Max. discharge current | approx. 40-50 mA (continuous) - Only for low loads |
| Dimensions (L x W x H in mm) | 14.5 x 25.2 (size 1/2 AA) |
| Connection | Standard, PCB pins or solder tabs |
| Temperature range | -55°C to +85°C |
| Special features | Extremely long-lasting (>10 years), standard for memory backup |
| Weight (g) | approx. 10 |
FAQs about the Ultralife UHE-ER14250-H
What does "1/2 AA" mean?
Half length: The designation refers purely to the mechanical size. The battery has the same diameter as a standard AA battery (14.5 mm), but is only half as long (approx. 25 mm). It therefore does not fit in normal AA compartments.
Can I replace it with a CR14250?
Be careful with the voltage: A CR14250 (lithium-manganese) usually has 3.0 volts. The ER14250 (like this Ultralife) has 3.6 volts. In many cases (e.g. dive computers) the difference is tolerable, but some sensitive electronics absolutely require the correct voltage. Check your device manual.
Is the battery rechargeable?
No. This is a primary battery. Never attempt to recharge it. If you are looking for a rechargeable battery in this size, you will usually need a LiFePO4 battery (3.2V) or Li-Ion (3.7V) in size 14250, but these require a special charger.
Is the battery available with solder tags?
Yes. As these batteries are often permanently installed on circuit boards (e.g. in industrial control systems), they are often available with different connection types:
- Standard: Flat terminals for insertion into holders.
- Axial: One wire comes out at the top and one at the bottom (for horizontal mounting).
- PCB/Tags: 2 or 3 pins on the underside for direct soldering. When purchasing, pay close attention to the required connection type.
| Capacity: | 1.2Ah |
|---|---|
| Tension: | 3,6V |
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