About this replacement
Snom C300 Bluetooth 5.0 Conference Speakerphone — 3.7V Li-ion Replacement Battery (ICR18650-2.6Ah-3.6V-1S1P)
This 3.7V 2600mAh Li-ion battery replaces the original ICR18650-2.6Ah-3.6V-1S1P cell in the Snom C300 Bluetooth 5.0 Conference Speakerphone. It restores power to a unit that no longer holds charge or fails to turn on. Capacity is 9.62Wh — matched to the original specification.
- C300 platform fit: The C300 uses a single-cell 1S1P 18650 pack with a built-in BMS that monitors voltage thresholds and communicates battery state to the unit's indicator circuit. This replacement uses the same cell format and connector orientation, so the BMS handshake initialises correctly on first boot.
- Bench tested on actual hardware: We cycled this pack through combined Bluetooth audio and wireless transmission draw — the BMS held stable across repeated connection events and did not trip on the dual-load spike typical of the C300's Bluetooth 5.0 radio negotiation.
- First-session calibration: After swapping this battery in, run one complete charge to 100% before your next meeting. The C300 maps battery state against voltage curves during normal operation, and the indicator may display inaccurate warnings until that first full cycle completes.
Battery indicator showing wrong level after installation
The C300 calculates remaining capacity by tracking voltage curves across charge and discharge cycles. A new battery has no stored history, so the unit's gauge reads against an empty baseline and can display incorrect percentages for the first session. This is not a fault with the battery or the unit. One full charge cycle — from flat to 100% without interruption — resets the mapping and the indicator will read correctly from that point forward.
C300 cuts out mid-meeting under combined audio and Bluetooth load
The C300 draws simultaneously from the speaker amplifier and the Bluetooth 5.0 radio during active conference calls. On a degraded or deeply discharged replacement battery, this combined draw can pull cell voltage below the BMS cutoff threshold — around 2.75V — triggering an abrupt shutdown. If the unit cuts out mid-session, check that the battery was fully charged before use and that the pack contacts are clean and fully seated. A pack that fails to recover above 3.0V after a standard charge cycle has likely suffered deep-discharge damage and needs replacement.