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Rectangular lithium-polymer battery, dark casing, two-wire connector, 51.75 by 36.70 by 13.36 mm

FYIOGXG ALPHA1100 900mAh 3.7V battery for 3M TAC300 TAC500

SKU CH-REJ4-HV8V1

Replacement lithium-polymer battery for 3M TAC300, TAC300-OTH and TAC500 headsets, 900 mAh at 3.7 V, 51.75 × 36.70 × 13.36 mm

  • Battery pack size51.75 × 36.7 × 13.36
  • Battery typeLithium polymer
  • Battery capacity900 mAh
  • Battery voltage rating3.7 V
  • Details51.75 × 36.7 × 13.36
  • Product typeLithium polymer
  • Compatible with 3M TAC300, TAC300-OTH and TAC500 headsets
  • 900mAh capacity delivers 3.33Wh of energy
  • Lithium-polymer chemistry at 3.7V nominal voltage
  • Compact 51.75 x 36.70 x 13.36mm size fits original slot
  • Built-in protection against overcharge, over-discharge and short circuits

Compatible replacement for 3M TAC headsets

This lithium-polymer battery replaces the original cell in 3M TAC300, TAC300-OTH and TAC500 wireless headsets. It matches the factory dimensions of 51.75 x 36.70 x 13.36 mm and weighs 30.4 g. A built-in protection circuit guards against overcharge, over-discharge, over-voltage and short circuit. The pack is certified to ISO9001, RoHS and CE standards.

Sustained capacity delivery

Rated at 900 mAh and 3.33 Wh, the cell maintains a steady 3.7 V output during extended talk time rather than only in short bursts. The decoded chip communicates with the headset exactly as the original does, so the fuel gauge remains accurate over repeated cycles. Performance stabilises after two or three full charge and discharge cycles.

3.7 V 900 mAh form factor

The single specification that decides fit is the 3.7 V, 900 mAh lithium-polymer pack in the 51.75 x 36.70 x 13.36 mm footprint. If your headset requires a different voltage, capacity or physical size, this battery will not work.

How it compares

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

Price $15.99
Pricier than about 70% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameFYIOGXG
Model nameReplacement for
Product typeLithium polymer
Power
Battery typeLithium polymer
Battery capacity900 mAh
Battery voltage rating3.7 V
In the box
Battery pack size51.75 × 36.7 × 13.36

Questions about this item

Does the 3.7 V 900 mAh lithium-polymer cell run hot during a full day of use in a 3M TAC500 headset?

The 3.7 V 900 mAh lithium-polymer pack is designed to the original 3M specifications and includes over-voltage and short-circuit protection, so it stays at normal operating temperature during extended shifts.

What must I already own to install this ALPHA1100 replacement battery in my headset?

You need a compatible 3M TAC300, TAC300-OTH or TAC500 wireless headset and a small screwdriver to open the battery compartment and reconnect the existing connector.

Will this 51.75 × 36.70 × 13.36 mm pack fit the original battery cavity of my older TAC300-OTH unit?

Yes, the dimensions and 30.4 g weight match the OEM cell exactly, so it slides into the same cavity and connects to the original wiring without modification.

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