Memorex MPH-6925 Cordless Phone Replacement Battery 2.4V 1500mAh

Memorex MPH-6925 — 2.4V Ni-MH Replacement Battery (BT-904)

This is a 2.4V, 1500mAh Ni-MH replacement battery for the Memorex MPH-6925 cordless phone handset. It replaces OEM part numbers BT-904 and BP-904. When the original pack no longer holds a charge, this battery restores the handset to normal operation.

• MPH-6925 handset fit: The MPH-6925 uses a 2.4V dual-cell Ni-MH pack in a compact sled form. The connector orientation and cell spacing match this handset's battery bay — no adapter or modification needed.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge runs on a 2.4V Ni-MH test rig. The BMS accepted charge without voltage-drop rejection errors, and capacity output tracked within spec across repeat cycles.
• First-charge protocol for Ni-MH cordless handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped from storage are partially discharged — a slow initial charge lets the pack reach its rated 1500mAh capacity. Skipping this step means the first few cycles will show lower-than-expected talk time.

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

Some MPH-6925 base stations use a delta-peak detection circuit to confirm charging — this circuit looks for a small voltage rise before signalling a charge state. A new Ni-MH pack shipped from storage can sit at 1.8–2.0V, below the threshold the base expects to see. The base interprets this as a fault rather than a flat battery. Leaving the handset seated for 30–60 minutes usually brings cell voltage up enough for the base to recognise the pack and switch to active charging.

Talk time shorter than expected after the first few uses

Ni-MH cells need three to five full charge-discharge cycles before they reach rated capacity — this is a chemistry characteristic, not a defect. On cycle one, you may get noticeably less talk time than the original battery delivered at its peak. Each subsequent full cycle conditions the cells and extends available capacity. By cycle four or five, output should stabilise at or near the rated 1500mAh.