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Rectangular lithium-ion battery pack, grey plastic casing with gold contacts, 38.9 by 34.25 by 5.5 millimetres

Cameron Sino 361-00026-00 Battery for Forerunner 205/305/305i 700mAh 3.7V

SKU CH-3S46-27XGE

Replacement lithium-ion battery for Garmin Forerunner 205, 305 and 305i GPS units, 700mAh at 3.7V

  • Battery pack size38.9 × 34.25 × 5.5
  • Battery capacity700 mAh
  • Battery voltage rating3.7 V
  • Details38.9 × 34.25 × 5.5
  • Compatible with Forerunner 205, 305 and 305i GPS units
  • 700 mAh capacity delivers 2.59 Wh of energy
  • 7 V lithium-ion cell matches original voltage
  • Compact 38.90 x 34.25 x 5.50 mm form factor fits factory bay
  • Certified to ISO 9001, RoHS and CE standards

Compatible replacement battery

This 700 mAh lithium-ion cell fits Garmin Forerunner 205, 305 and 305i GPS units. It matches the original 3.7 V specification and the 38.90 x 34.25 x 5.50 mm form factor. The pack weighs 14 g and carries ISO 9001, RoHS and CE certification.

Fully decoded chip and protection

A new fully decoded chip makes the battery communicate with the watch exactly like the factory unit. Built-in circuitry guards against overcharge, over-discharge, over-voltage and short circuits. The retail box includes shock-absorbing foam for safe transport.

Capacity and practical limits

The 2.59 Wh rating restores typical training-session runtime for the supported models. It is not suited for devices that require higher capacity or a different voltage. Users needing multi-day ultra-endurance logging should verify the original battery’s endurance first.

How it compares

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

Price $11.99
Pricier than about 55% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameCameron Sino
Model nameForerunner 205, forerunner 305, forerunner 305i
Part number361-00026-00
Power
Battery capacity700 mAh
Battery voltage rating3.7 V
In the box
Battery pack size38.9 × 34.25 × 5.5

Questions about this item

How many charge cycles before the 700mAh 3.7V lithium-ion cell needs replacement?

The battery reaches best performance after two or three full charge and discharge cycles and is designed to last through many further cycles before capacity drops enough to require replacement.

What limits runtime first during continuous GPS use on a Forerunner 205, 305 or 305i?

The 700mAh 2.59Wh capacity sets the energy ceiling, so sustained GPS tracking will drain the pack until the built-in protection circuit cuts power to prevent over-discharge.

How warm does the 38.90 x 34.25 x 5.50 mm pack get when the navigator runs all day?

Normal operation stays well below the 60 °C storage limit; the protection circuitry guards against over-voltage and short-circuit heating during extended use.

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