Plantronics CT460 Cordless Phone Replacement Battery 3.6V 600mAh

Plantronics CT460 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 600mAh Ni-MH battery for the Plantronics CT460 cordless phone headset. It replaces the original pack when the headset no longer holds a charge or fails to power on. Voltage and cell chemistry match the factory specification.

• CT460 headset compatibility: The CT460 uses a compact Ni-MH cell pack running a 3.6V rail. The base station's charging circuit is tuned to Ni-MH charge curves — swapping to a different chemistry would break the charge cycle. This replacement keeps that circuit working as the manufacturer intended.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the CT460 platform. The base station accepted the battery without error, and voltage held stable across the transmit load during testing.
• First-charge protocol for Ni-MH cordless batteries: After installing, seat the headset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped in a partially discharged state need this slow initial charge to reach rated capacity. Skipping it results in shorter talk time that may not recover.

Talk time shorter than original battery after replacement

Ni-MH cells do not deliver full rated capacity straight out of the box. Storage and shipping leave them in a low-charge state, and the first few cycles are spent conditioning the cells. Expect three to five full charge-discharge cycles before talk time reaches its rated level. If talk time is still short after five cycles, confirm the headset is fully seated in the base during each charge — poor contact is the most common cause of incomplete charging on the CT460.

Base station showing no charge or error light after battery swap

The CT460 base station checks for a minimum voltage before starting the charge cycle. A new Ni-MH pack from storage can sit below that acceptance threshold, causing the base to show an error or no charging indicator at all. Remove the headset, wait 10 seconds, and reseat it firmly — this resets the charge detection circuit. If the error persists, check that the battery contacts on the headset are clean and making full contact with the base cradle pins.