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Rectangular lithium-ion battery pack, dark casing, gold contacts, 98 by 53.5 by 23.9 mm

Cameron Sino THR9 Battery BLN-5i BLN-6 5700mAh

SKU CH-T0FP-Z2VVV

Replacement lithium-ion battery for TETRA CASSIDIAN THR9 two-way radios with 5700mAh capacity and 3.7V output

  • Battery pack size98 × 53.5 × 23.9
  • Battery capacity5,700 mAh
  • Details98 × 53.5 × 23.9
  • High 5700mAh capacity powers THR9 radios longer
  • 7V 21.09Wh lithium-ion cell matches original specs
  • ISO9001 RoHS CE certified for safe operation
  • Built-in protection against overcharge over-discharge short circuit
  • 00 x 53.50 x 23.90mm fits THR9 THR9i C-30

Replacement for TETRA CASSIDIAN THR9

This 5700mAh lithium-ion battery replaces the original BLN-5i and BLN-6 packs in TETRA CASSIDIAN THR9 two-way radios. It delivers 21.09Wh at 3.7V and matches the factory dimensions of 98.00 x 53.50 x 23.90mm. A fully decoded chip ensures communication with the radio exactly like the original unit. The pack weighs 126.0g and carries ISO9001, RoHS and CE certification.

Steady output over a full shift

The 5700mAh capacity is rated for continuous discharge at the radio's nominal draw rather than a brief peak. Built-in protection guards against overcharge, over-discharge, over-voltage and short circuit, keeping voltage stable through long talk cycles. After two or three complete charge and discharge cycles the cells reach their full usable capacity. The protection circuit prevents the voltage sag that can cause a radio to cut out late in a shift.

Verify model and part number first

Check that your radio is a TETRA CASSIDIAN THR9, THR9 C-30 or THR9i and that the original battery carries part number BLN-5i or BLN-6. Confirm the connector layout matches the replacement before fitting. Use only a quality charger; low-grade adapters reduce cycle life. Do not disassemble, expose to fire or water, or store above 60°C. The pack is not suitable for radios that require a different voltage or form factor.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $26.99
Pricier than about 83% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameCameron Sino
Model nameTHR9, THR9 C-30, THR9i
Part numberBLN-5i, BLN-6
Power
Battery capacity5,700 mAh
In the box
Battery pack size98 × 53.5 × 23.9

Questions about this item

Does the 5700 mAh lithium-ion cell generate noticeable heat during extended transmit sessions?

The pack is rated at 3.7 V and 21.09 Wh; under normal two-way radio duty cycles it stays within typical operating temperature limits.

What charger connector does the BLN-5i replacement require?

It uses the same connector as the original THR9 battery, so the standard TETRA CASSIDIAN desktop or vehicle charger works without an adapter.

Will this 98.00 x 53.50 x 23.90 mm pack fit the belt clip on my older THR9 C-30?

Dimensions match the original BLN-5i and BLN-6, so the existing belt clip and battery latch engage exactly as before.

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