Binatone Unit1 Cordless Phone Replacement Battery 3.6V 1200mAh

Binatone Unit1 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1200mAh Ni-MH rechargeable battery for the Binatone Unit1 cordless phone handset. It replaces the original pack when the handset no longer holds a charge or powers on. Slot it in, seat the handset in the base, and run the conditioning cycle before use.

• Binatone Unit1 handset fit: The Unit1 base station delivers a trickle charge matched to a 3.6V Ni-MH cell. This pack matches that voltage rail and physical footprint, so the charging contacts align and the base accepts the battery without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a 3.6V Ni-MH test rig. The cell reached rated capacity by the fourth cycle, which is normal Ni-MH behaviour — early cycles run short until the chemistry stabilises.
• 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 in a partially discharged state need that slow initial charge to reach the 1200mAh rated capacity. Pulling it off the base after a few hours will leave capacity on the table for the first several cycles.

Range dropping on the Unit1 after a battery swap

The Unit1 handset boosts its RF transmit power from the battery rail directly. A Ni-MH pack that hasn't completed its first conditioning cycle has a higher internal resistance than a broken-in cell. Under the RF transmit load, voltage sags enough to reduce effective range. This isn't a fault with the battery or the base station — it corrects itself after three to five full charge and discharge cycles. If range is still short after five cycles, check that the handset sits flush in the base cradle with clean contact points.

Base station showing no charge or error light with a new battery installed

Ni-MH batteries can drop below 3.0V during storage. Some cordless base stations check the pack voltage before committing a charge current — if the reading is too low, the base refuses to charge and shows an error. Remove the handset from the base, wait ten seconds, then reseat it firmly so both charging contacts engage. If the error persists, the base may need the pack voltage to recover slightly — place it in a second compatible handset or a universal Ni-MH charger at 100mA until the cell reads at least 3.2V, then return it to the Unit1 base.