Maestro BE900FA Cordless Phone Replacement Battery 3.6V 700mAh

Maestro BE900FA — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH rechargeable battery for the Maestro BE900FA cordless phone handset. It replaces the original pack when capacity has faded and the handset can no longer hold a charge through a normal day. Voltage and cell chemistry match the original specification exactly.

• BE900FA handset fit: The BE900FA uses a single Ni-MH cell pack at 3.6V to power both the DECT radio and the audio circuit. The physical dimensions — 45.60 × 31.30 × 10.60mm — and connector orientation match the original battery bay without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a Ni-MH analyser. The BMS accepted charge normally from a standard 3.6V base station charger, and cell voltage settled at the expected 1.2V per cell under load with no anomalous heat.
• First charge on a Ni-MH cordless handset: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells ship partially discharged. A slow first charge lets all three cells reach balanced capacity — skipping this step is the most common cause of short talk time complaints.

Talk time shorter than the original battery after replacement

New Ni-MH cells do not reach rated capacity on the first cycle. It typically takes three to five full charge-and-discharge cycles before the cells condition fully. During this period, talk time will be noticeably shorter than what the 700mAh rating suggests. Run the handset until it cuts out, return it to the base for a full charge, and repeat — capacity increases with each cycle.

Base station showing no charge or error light after battery swap

Ni-MH packs lose voltage during storage. If the battery voltage drops far enough, the base station's charge controller may not recognise it as a valid pack and will refuse to begin a charge cycle. Remove the handset, leave it out of the base for 30 seconds, then reseat it firmly — full contact on the charge pins is required. If the error persists, the pack voltage may need a brief trickle pre-charge; a universal Ni-MH charger at 50mA for 15 minutes is enough to bring it above the base station's acceptance threshold of approximately 3.0V.