1/26650-W-C085F – 3.2V 4Ah LiPO4 Emergency Lighting Battery

Other Information for the 1/26650-W-C085F

Cross referenced with other manufacturers part numbers:

BBL 1/26650-W-C085F
26650 3.2V 3000mAh

If a connector is fitted please check that the plug is correct and that the red + lead is in the correct position. If any terminals are fitted then please check that the sizes of these are correct.

In the whole battery market, from big energy storage for photovoltaic systems and electric vehicles to small handheld devices, there is a movement from well-known technologies, which were used for decades, to the relatively new lithium based technologies.

The main benefits of lithium based technologies are a very high energy density, and a long lifetime up to twice that of the NiCd or NiMH
batteries.

When using lithium batteries there are some points that have to be considered. There have been reports about possible risks of the lithium technology, which are mostly caused by the chemical reactivity of some lithium technologies.

LiFePO4 (Lithium Iron Phosphate) batteries are a type of rechargeable lithium-ion battery known for their excellent safety, long cycle life, thermal stability, and lack of cobalt, making them a popular choice for applications like solar storage, electric vehicles (EVs), RVs, and off-grid systems where longevity and reliability are more important than the highest energy density.

Best Practices & Safety

Thermal Management: While extremely stable, safe operation relies on effective thermal management. Many modern emergency lighting systems use inverters with continuous temperature monitoring to prevent critical issues and protect battery health.

Not All Lithium is the Same: LiFePO4 should not be confused with the Lithium-Cobalt or Lithium-Manganese chemistries used in mobile phones or electric vehicles. LiFePO4 is the only lithium chemistry recommended for standby emergency applications due to its resistance to internal degradation.

They offer a safer alternative to traditional lithium-ion batteries, charge faster, last significantly longer (thousands of cycles vs. hundreds), and can withstand higher temperatures without degrading, though they are typically heavier and bulkier than cobalt-based alternatives.

https://www.whitecroftlighting.com/sustainability/lifepo4-emergency-light-battery/

Characteristics:

• Suited for high temperature operation (up to 55 °C)
• Design life: 4 years at 55 °C – 8 years at 35 °C
• Storage time: up to 12 months from production date
• Higher energy density than NiCd and NiMH batteries
• Non-critical to the environment – no heavy metal content

Common Applications:

• Solar Energy Storage & Home Backup
• Electric Vehicles (EVs) & Mobility Scooters
• RVs, Caravans, & Campervans
• Golf Carts
• Marine & Off-Grid Power Systems
• Emergency Lighting

Connectors on emergency lighting batteries are vital for safely linking the backup battery pack to the emergency driver or inverter. They come in several variations, with JST connectors, Molex plugs, and fast-on (spade) terminals being the most common.

Because emergency lights are life-safety systems, these connectors must securely lock to prevent accidental disconnection from vibration. When replacing batteries, using an identical connector guarantees correct polarity.

JST connectors on emergency lighting batteries are small, standardized plugs used to connect the battery pack to the emergency driver or inverter. They provide a reliable, plug-and-play connection, making it easy to replace expired batteries without rewiring the fixture.

Common Types and Sizes

While “JST” broadly refers to a range of compact, white wire-to-board connectors made by the J.S.T. Mfg. Co. (Japan Solderless Terminal), in emergency lighting, you will generally encounter two specific varieties:

JST-XH: These are common on older or smaller exit signs and emergency battery packs. They have a 2.5 mm pin-to-pin distance (pitch).

JST-PH: These are smaller, featuring a 2.0 mm pitch. They are increasingly used in modern, compact LED emergency drivers.