Spark Logic

18650 protected battery pack connection guide

18650 protected battery pack Protected pack connector wiring guide with power, signal assignments, and bench checks.

Bare cylindrical cell 2 contacts

Protected pack connector

2 contacts Current package

Molicel and Honcell · Honcell HCC18650FC · JST VHR-2N, pin 1 at the red lead in the drawing on p. 5.

Verify the protected pack harness

Required

Use an intact factory-assembled HCC18650FC pack and a matching shrouded harness. Keep the load and charger disconnected while identifying polarity.

  • Pack positive
    • P+ (1)
    • Harness positive contact
  • Pack return

Bench checks

  • Set the meter to DC volts and use insulated, touch-safe measurement points on the harness. Connect its black lead to the harness return and check that the other contact measures positive.
  • For the load test below, use a pack showing 3.2–4.2 V at rest. If the voltage is outside this bench window or the pack is damaged, stop and follow the pack maker’s instructions.

Honcell HCC18650FC datasheet, §§ 3–5 and 15. The bench window is chosen for this test.

Connection scenarios

Power a small resistive load

With the pack disconnected, attach a 1 kΩ, 0.25 W resistor to the insulated mating harness. Leave the charger disconnected and keep the resistor and joints insulated before plugging in the pack.

Protected Honcell pack P+ and P− connected through its mating harness to a 1 kilohm load.Protected packP+P−R1 1 kΩ

Bench checks

  • Measure across R1 with the black probe on P−. With 3.2–4.2 V across the load, Ohm’s law gives 3.2–4.2 mA nominal. At 4.2 V the resistor dissipates about 18 mW.
  • Disconnect the harness after the test. If the loaded voltage collapses, disconnect the pack and check the harness and resistor for a short with the pack removed.

Honcell HCC18650FC datasheet, §§ 3–5. R1 and the test current are bench choices.

Protected pack connector wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Protected pack connector
JST VHR-2N contacts by number. Match pin 1 to the red lead in the manufacturer drawing and verify the mating harness polarity.
Selected pin details

2 · P−

Negative terminal · Ground

Black lead from protected pack return to pin 2 of the JST VHR-2N.

Honcell HCC18650FC datasheet, pp. 5–7

Electrical limits · Pin in the reference

Models and documents

This reference covers the bare Molicel INR-18650-P28A and the separately documented Honcell HCC18650FC protected assembly. Check the exact manufacturer code for chemistry, voltage, capacity, load rating, protection and fit.

HCC18650FC
3.7 V nominal, 2600 mAh typical, with the connector and protection circuit in ED-RE-02.