Incom ICW-1000B Cordless Phone Compatible Battery 3.7V 1100mAh

Incom ICW-1000B — 3.7V Li-ion Replacement Battery

This 3.7V 1100mAh (4.07Wh) lithium-ion battery replaces the original pack in the Incom ICW-1000B cordless phone handset. It restores power to a handset that no longer holds charge or shuts off unexpectedly during calls. No OEM part number is published for this cell, but the dimensions — 53.40 × 34.22 × 5.40mm — match the ICW-1000B battery bay directly.

• ICW-1000B handset fit: The ICW-1000B uses a slim single-cell Li-ion pack at 3.7V nominal. The connector orientation and cell footprint are specific to this handset — the base station charges via contact pins that expect this exact voltage range to trigger the charging circuit.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, monitoring BMS cutoff at both ends. The protection circuit tripped correctly at high-voltage cutoff and low-voltage lockout, keeping the cell within safe operating limits across multiple cycles.
• First-charge protocol for Li-ion cordless handsets: After installing this battery, seat the handset in the base and leave it for a full charge cycle before making any calls. Li-ion cells shipped in storage-state charge need one complete charge before the BMS registers accurate capacity.

Why the ICW-1000B base station shows no charge indicator on a new battery

Li-ion cells in storage are typically held at around 3.6–3.7V to reduce degradation during shipping. Some cordless base stations expect the handset battery to be below a threshold voltage before triggering the charge circuit — if the cell arrives at or above that threshold, the base reads it as already charged and shows no activity. This is not a fault. Seat the handset, wait ten minutes, then remove and reseat it. The base should pick up the charge cycle once the BMS communicates cell state correctly.

Handset not pairing with base after battery replacement

Removing a depleted Li-ion pack cuts all power to the ICW-1000B handset, which clears the DECT pairing stored in volatile memory on some units. The handset comes back up with no registered base, so it won't ring or transmit. Re-register the handset using the base station's paging or registration button — typically hold it for five seconds until the base confirms the link. Once paired, fully charge the handset before testing call quality.