Albrecht AE900 Cordless Phone Replacement Battery 3.6V 1200mAh

Albrecht AE900 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1200mAh Ni-MH replacement battery for the Albrecht AE900 cordless DECT phone handset. It slots into the handset battery compartment and restores power to the phone for voice calls. No OEM part number is published for this cell, but the voltage, capacity, and physical dimensions match the original specification.

• AE900 handset fit: The AE900 runs a single 3.6V Ni-MH cell stack. This pack matches that voltage rail and the physical footprint — 42.40 × 49.90 × 14.40mm — so it seats correctly in the battery bay and makes clean contact with the charging pins.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Ni-MH test rig. The BMS accepted charge current without interruption and held voltage steady across the full discharge curve without premature cutoff.
• First-charge conditioning on the AE900: Place the handset in the base for a full 16-hour charge before making any calls. Ni-MH cells shipped in partial-charge state will not reach rated capacity until they complete a slow, uninterrupted first charge — skipping this step permanently reduces available capacity.

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

Ni-MH batteries lose voltage during storage. If the pack voltage drops low enough, the AE900 base station's charge circuit may not recognise it as a valid battery and will refuse to begin charging. This is a threshold protection built into the base — not a fault with the battery itself. To recover the pack, leave the handset seated in the base for at least 30 minutes without removing it. Most base stations will trickle enough current to bring the cell voltage up to the acceptance threshold and then switch to normal charge mode.

Talk time shorter than expected after the first few charges

Ni-MH cells do not deliver full rated capacity on the first charge cycle. Expect reduced talk time for the first three to five full charge-and-use cycles — this is normal electrochemical conditioning, not a defective battery. Each cycle allows the cell chemistry to stabilise and the capacity to build toward the rated 1200mAh. If talk time is still noticeably short after five full cycles, check that the handset is fully seated flat in the base between uses, as a partial contact on the charge pins will produce an incomplete charge.