Alcatel Biloba 490 Replacement Battery 3.6V 300mAh

Alcatel Biloba 490 / 590 / Versatis D100 Duo — 3.6V Ni-MH Replacement Battery (37AAAM3BMJ)

This is a 3.6V, 300mAh Ni-MH battery for the Alcatel Biloba 490, Biloba 590, and Versatis D100 Duo cordless handsets. It replaces OEM part numbers 37AAAM3BMJ, 3BN66090AAAC, and 30AAAM3BMJ. Physical dimensions are 30.00 × 32.00 × 10.50mm — verify fit before ordering if you have an older revision handset.

• Biloba 490, 590, and Versatis D100 Duo compatibility: All three models share the same 3.6V single-cell NiMH pack format, identical connector, and the same base station charge circuit. One battery part number covers the full range.
• Bench tested on actual hardware: We cycled this pack on the Biloba 490 base station and confirmed the charge circuit accepted the battery without error. Voltage rose steadily through the charge curve with no premature cutoff.
• First-charge protocol for NiMH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells at low state of charge from storage will not reach rated capacity on a short charge — the long first cycle conditions the cells properly.

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. On the first cycle, the Biloba's base station may cut the charge short because the cell voltage rises faster from low capacity than it will once the pack is conditioned. Each subsequent full cycle extends available talk time until the pack stabilises at its rated 300mAh. If talk time is still noticeably short after five full cycles, check the base contacts and handset terminals for oxidation — a poor connection limits charge acceptance.

Base station charge indicator not lighting after battery swap

NiMH packs that have been sitting in storage can drop below the voltage threshold the Biloba base uses to detect a valid battery. If the charge light stays off or flashes an error, the pack voltage is likely too low for the base circuit to recognise it. Remove the handset, wait 10 seconds, reseat it firmly, and confirm both the handset contact strip and base pins are clean and making full contact. If the light still does not come on, check the resting voltage at the battery terminals — it should read at least 3.0V for the base to begin charging.