Rayovac CO119P Cordless Phone Replacement Battery 2.4V 600mAh

Rayovac CO119P2 — 2.4V Ni-MH Replacement Battery (CO119P)

This is a 2.4V, 600mAh Ni-MH replacement battery for the Rayovac CO119P2 cordless phone handset. It fits the CO119P2 model directly and restores power when the original cell no longer holds a charge. Voltage and capacity match the original specification exactly.

• CO119P2 handset fit: The CO119P2 uses a 2.4V two-cell Ni-MH pack with a specific contact pitch and connector orientation. This replacement matches that footprint, so the contacts seat correctly in the handset battery bay without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a cordless phone test rig. The BMS accepted charge from a standard base station within normal parameters, and the handset powered on without error at full charge.
• First-charge protocol for Ni-MH cordless packs: After installing, place the handset in the base for a full 16 hours before first use. Ni-MH cells shipped from storage are partially discharged, and the first slow charge cycle is what brings them to rated capacity. Skipping this step is the most common reason a new battery underperforms from day one.

Base station showing no charge light on a fresh Ni-MH pack

Ni-MH batteries stored for several months can drop below 2.0V. Some cordless base stations have a minimum acceptance threshold and will not initiate a charge cycle if the pack voltage is too low. This is not a defective battery or a faulty base — it is a voltage floor check. Place the handset in the base anyway and leave it for 30 minutes. Most bases will trickle charge a low pack back above the threshold, at which point the charge indicator activates and normal charging resumes.

Talk time shorter than expected for the first few uses

Ni-MH cells do not deliver full rated capacity on the first cycle. It typically takes three to five full charge-and-discharge cycles before the pack reaches 600mAh. Each cycle, the active material in the cells becomes more accessible and capacity steps up incrementally. To condition the pack, use the handset until the low-battery indicator activates, then return it to the base for a full charge — repeat this for the first five uses and talk time will stabilise at rated capacity.