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The Ultralife U9VLJP-BP (technical designation U9VL-J-P) is the world’s best-known and most widely used 9V lithium battery for long-term applications. It is the modern successor to the classic alkaline 9V blocks and outperforms them in every respect: it lasts up to 5 times longer, is lighter and functions reliably even at extreme temperatures. It is particularly well known as the "10-year battery" for high-quality smoke alarms, as it often does not need to be replaced throughout the entire service life of the alarm. It is shipped in a practical single blister pack (BP = Blister Pack).

Highlights at a glance

  • 10 years of safety: Enables a service life of up to 10 years in many ion smoke alarms, making those annoying night-time "beeps" due to low batteries a thing of the past.
  • Maximum capacity (1200mAh): With 1200 mAh, it offers almost twice the capacity of a high-quality alkaline battery (approx. 500-600 mAh) and four times that of a zinc-carbon battery.
  • Flat discharge curve: Maintains a consistently high operating voltage for a long time. Whilst alkaline batteries lose voltage linearly, the Ultralife delivers full power right up until the end.
  • Ultralight: Weighing approx. 37 g, it is around 25 % lighter than a conventional 9V block battery (approx. 45-50 g), making it ideal for portable devices such as wireless microphones or medical monitors.
  • Extreme temperature range: Operational from -20 °C to +60 °C – perfect for use in cold garages, storage rooms or outdoors (e.g. electronic door locks).
  • Long shelf life: Thanks to lithium technology, it has an extremely low self-discharge rate and can be stored for up to 10 years without any issues before being used.

The standard for smoke alarms & medical technology

The Ultralife U9VLJP is the original equipment battery for almost all major manufacturers of high-quality smoke alarms. Furthermore, it is extremely popular in medical technology (infusion pumps, patient monitors), in security technology (alarm systems, motion detectors), among musicians (active pickups in guitars, wireless systems) and in industry for data loggers.
 

Features

ModelUltralife U9VL-J-P (U9VLJP-BP blister)
ApplicationSmoke alarms (10-year use), medical, audio, security
TechnologyLithium manganese dioxide (Li-MnO2) - primary cell
Voltage9 V (nominal) - voltage-stable
Capacity1200 mAh (twice as much as alkaline)
Shelf life10 years (low self-discharge)
Dimensions (L x W x H in mm)48.5 x 26.5 x 17.5 (standard 9V block / E-block / 6LR61)
ConnectionSnap connector (miniature press stud)
Temperature range-20°C to +60°C (ready for use even in cold conditions)
Special featuresThe "10-year battery", very light, no leakage
Weight (g)approx. 37 (significantly lighter than alkaline ~45g)
 

FAQs about the Ultralife U9VLJP-BP

Is this battery rechargeable?

No! This is the most common misconception. It is a lithium primary battery (disposable). Never attempt to recharge this battery in a charger (risk of explosion). If you are looking for rechargeable 9V batteries, you will need "NiMH" or "Li-ion batteries" (often 8.4V or 7.4V).

Does it fit mechanically in every device?

Yes, the U9VLJP complies with the standard size ANSI 1604. In very rare cases with very old devices, the battery compartment may be extremely tight-fitting, as alkaline batteries have rounded corners, whereas the Ultralife is slightly more "angular" (see image). However, it fits perfectly in 99.9 % of modern devices (smoke alarms, multimeters, toys).

Why is it so much more expensive than an alkaline battery?

The higher price is offset by the service life. An Ultralife lasts up to 5x longer than a standard battery.

  • Calculation example: If you replace an alkaline battery (approx. €2) in a smoke alarm every 1-2 years and have to fetch a ladder each time, that costs approx. €10-20 plus labour over 10 years. An Ultralife (approx. €8-10) often lasts the full 10 years. You save money and effort.

How do I dispose of the battery?

As this is a lithium battery, please cover both terminals with a strip of adhesive tape before disposal (risk of short circuit in the collection container). Then hand it in at an official battery collection point (supermarket or recycling centre).

Properties
Capacity: 1.2Ah
Tension: 9V
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VISCP1270
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VISCP12120F2
Vision lead-acid battery CP12120F2 with 12V and 12Ah

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XCEXP712
XCELL XP7-12 AGM industrial battery – 12 V and 7.0 Ah

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XCEXP1212F2
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YUANP12/12
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YUANP17/12I
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