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Blue PVC-wrapped rectangular pack with two 18650 cells and red-black wire leads

DUSLAN

DUSLAN 7.4 V 3500 mAh Li-ion battery pack 2 × 18650

SKU CH-ZKRC-CRYSK

A 7.4 V 3500 mAh lithium-ion pack built from two Samsung 18650 cells with an integrated protection PCB and polyswitch limiting discharge to 4.2 A

  • Battery TypeBattery Pack
  • 3500 mAh capacity powers devices longer between charges
  • Built-in protection IC prevents over-charge, over-discharge and short circuits
  • Two Samsung 18650 cells deliver 7.4 V nominal voltage
  • 2 A polyswitch limits peak discharge current for safe operation
  • Compact PVC-wrapped pack measures 2.8" × 1.45" × .8" and weighs 3.5 oz

What this battery pack is

The DUSLAN 7.4 V 3500 mAh pack uses two Samsung 18650 lithium-ion cells in a PVC-wrapped module with 18 G wire leads. An on-board PCB and a 4.2 A polyswitch guard against over-charge above 8.4 V, over-discharge below 5.5 V, short circuits and reverse polarity. Rated capacity is 3500 mAh at a nominal 7.4 V or 7.2 V working voltage.

When the upgrade makes sense

It replaces loose 18650 cells or older NiMH packs where a single protected module simplifies wiring and improves safety. The jump is worth it when a project needs a ready-made 7.4 V source with built-in current limiting at 4.2 A and a maximum charge current of 2.5 A, avoiding the hassle of custom protection circuits or cell balancing boards.

Who this suits and who should look elsewhere

Makers building portable 7.4 V devices, robotics projects or RC equipment that fit the 2.8" × 1.45" × .8" footprint and 3.5 Oz weight will find it convenient. Buyers who need higher voltage, larger capacity or a different form factor should look elsewhere.

Highlights

  • 3500 mAh capacity powers devices longer between charges
  • Built-in protection IC prevents over-charge, over-discharge and short circuits
  • Two Samsung 18650 cells deliver 7.4 V nominal voltage
  • 2 A polyswitch limits peak discharge current for safe operation
  • Compact PVC-wrapped pack measures 2.8" × 1.45" × .8" and weighs 3.5 oz

Specifications

Battery TypeBattery Pack

Questions about this item

What are the physical dimensions of the 2 × 18650 pack?

The pack measures 2.8 inches long, 1.45 inches wide and 0.8 inches high, weighing 3.5 oz.

How do I connect the 18 G wire leads safely?

Solder the leads to your device observing correct polarity; the installed 5 A PCB prevents over-charge above 8.4 V, over-discharge below 5.5 V and short circuits.

When should the internal Polyswitch or cells be replaced?

The 4.2 A Polyswitch resets automatically after a fault; replace the pack only when capacity drops well below 3500 mAh or voltage no longer holds between 7.2 V and 8.4 V.

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