359450 Cordless Phone Replacement Battery 3.6V 600mAh Ni-MH

Battery Country 359450 — 3.6V Ni-MH Replacement Battery for Cordless Phones

This is a 3.6V, 600mAh Ni-MH replacement battery carrying OEM part number 359450. It fits cordless phone handsets that originally used a 3.6V Ni-MH pack of this form factor. If your handset no longer holds charge or the original battery has swollen or failed, this is the direct swap.

• 3.6V Ni-MH cordless phone platform: Most DECT and 900MHz cordless handsets in this voltage class share a standardised cell configuration — three NiMH cells in series at 1.2V each. The BMS in the base station expects this nominal voltage for charge acceptance and status signalling. This pack matches that electrical profile.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a 3.6V NiMH-compatible test rig. The BMS accepted the pack without error flags on first insertion, and voltage held within spec across the first three full cycles.
• First-charge conditioning for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16-hour charge before first use. NiMH cells in cordless phones need this slow initial charge to reach rated capacity — skipping it leaves you with noticeably shorter talk time from day one.

Talk time shorter than the original battery after replacement

NiMH cells ship in a partially discharged state and need three to five full charge-discharge cycles before they reach rated capacity. The base station also re-calibrates its charge timer based on what it sees from the pack. Running the handset until the low-battery alert triggers, then returning it to the base for a full charge, conditions the cells correctly. After five cycles, talk time should be at or near the 600mAh rated figure.

Base station showing a charging error or no-charge light after fitting a new pack

NiMH batteries lose voltage during storage — if this pack sat in a warehouse, its resting voltage may have dropped low enough that the base station's charge controller rejects it as a fault condition. Most cordless base chargers use a delta-V detection circuit that needs the pack above roughly 3.0V to begin a charge cycle. Remove the handset, wait 30 seconds, and reseat it firmly — this resets the charge controller handshake. If the error persists, use a standalone NiMH charger to bring the pack above 3.2V before returning it to the base.