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Two Ultralast 18650 lithium-ion cells in a retail blister pack

Ultralast

Ultralast UL1865-34-2P 18650 Li-Ion Battery 2-Pack 3400 mAh 3.7 V

SKU CH-D23F-MF097

Two 18650 lithium-ion cells deliver 3400 mAh at 3.7 V each, supplied in a retail blister pack

  • TypeAmplifier Installation Kits
  • Two 3400 mAh cells for longer runtime
  • 7 V Li-Ion chemistry matches device specs
  • 18650 form factor fits standard holders
  • Blister card keeps cells protected and organised
  • 2-pack delivers a ready spare pair

Ultralast 18650 3400 mAh battery pair

These Ultralast 18650 lithium-ion cells deliver 3.7 volts and 3400 mAh each. The pack contains two batteries on a single blister card. They suit devices that require standard 18650 format power. Buyers who need a different voltage or capacity should look elsewhere.

Thermal behaviour and power draw

Each cell provides a nominal 3.7 volts and 3400 mAh rating. Normal use stays within the chemistry’s standard thermal envelope. No active cooling or external thermal management is included. Users who require integrated temperature monitoring must add their own solution.

Blister card packaging benefit

The retail blister card holds both 18650 cells together for shelf storage. It protects terminals from accidental contact during handling. The card also allows easy visual inspection before installation. Buyers who prefer loose cells or bulk trays will not find that format here.

Highlights

  • Two 3400 mAh cells for longer runtime
  • 7 V Li-Ion chemistry matches device specs
  • 18650 form factor fits standard holders
  • Blister card keeps cells protected and organised
  • 2-pack delivers a ready spare pair

Specifications

TypeAmplifier Installation Kits

Questions about this item

How do I insert the 18650 cells into a device without reversing polarity?

Align the positive button top with the device's plus marking and the flat negative end with the minus marking; the common mistake is forcing a cell in backwards which can damage both the battery and the equipment.

When will the 3400 mAh 18650 batteries need replacing?

Replace them when they no longer hold a useful charge or when voltage drops below the device's cut-off under load; typical service life is several hundred full charge cycles depending on depth of discharge and temperature.

What runtime limit appears first during continuous high-drain use of these 3.7 V cells?

The 3400 mAh capacity sets the energy limit; sustained high current will deplete the available milliampere-hours faster and cause voltage sag that triggers the device's low-voltage protection before the cells overheat.

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