Sigma L000 Cordless Phone Compatible Battery 3.6V 1200mAh

Sigma L000 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1200mAh Ni-MH replacement battery for the Sigma L000 cordless phone handset. It slots into the handset battery compartment and powers both active calls and standby operation. No OEM part number is published for this model — fit is confirmed by voltage, chemistry, and physical dimensions (42.40 x 49.90 x 14.40mm).

• L000 handset compatibility: The Sigma L000 runs a 3.6V NiMH cell with a three-contact terminal layout. Voltage and physical size must match exactly — a mismatched cell height prevents the battery door from seating, and a voltage mismatch will trigger the base station's charge circuit to reject the pack entirely.
• Bench tested on actual hardware: We cycled this pack through the L000's charge circuit and confirmed the BMS accepted the NiMH chemistry without triggering a fault light. Charge termination fired correctly at full capacity, and the cell held voltage under RF transmit load without sagging below the handset's low-battery cutoff threshold.
• First charge on the L000 base station: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells ship partially discharged, and the L000's trickle-charge circuit needs a complete slow charge to bring the pack to rated capacity — a short charge will leave usable capacity on the table for the first several cycles.

Talk time shorter than original battery after replacement

NiMH cells don't reach rated capacity on the first cycle — this is normal chemistry, not a fault. The L000's charge circuit runs a slow trickle charge, and a new pack typically needs three to five full charge-and-use cycles before it hits 1200mAh. Interrupting those early cycles short-charges the cell and locks in a false capacity ceiling. Run three full cycles — full charge, use until low-battery indicator triggers, return to base — and talk time will increase each time.

Base station showing no-charge or error light after battery swap

The L000 base station reads pack voltage before starting the charge cycle. A NiMH cell that sat in storage can drop below the base's acceptance threshold — typically under 3.0V — and the base interprets this as a faulty or missing battery. Remove the handset, wait 10 seconds, and re-seat it firmly so all three contacts are fully engaged. If the error persists, a brief manual reset of the base station clears the charge controller and allows it to re-read the pack voltage from scratch.