38P327N0 Avaya Cordless Phone Replacement Battery 4.8V 700mAh

Avaya 107733115 / 3204 Series — 4.8V Ni-MH Replacement Battery (38P327N0)

This is a 4.8V, 700mAh Ni-MH battery for Avaya cordless DECT handsets including the 107733115, 2C2, 3204, and 14 additional models sharing the same pack format. It replaces OEM part numbers 38P327N0, PTS360, and 700245509. When the original cell can no longer hold a charge through a full conversation, this is the direct swap.

• Multi-model fit across the Avaya DECT range: The 107733115, 2C2, and 3204 handsets share the same 4.8V three-cell NiMH pack format and connector pinout. One battery covers all these models because the base station charges at the same voltage rail and the BMS handshake is identical across the series.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT handset base. The BMS accepted charge from cold storage without triggering a fault light, and cell voltage balanced across all three cells within the first full cycle.
• First charge on NiMH cordless packs: After installing, seat the handset in the base for a continuous 16-hour charge before first use. NiMH cells shipped in a partial state need a slow, uninterrupted initial charge to reach rated 700mAh capacity — skipping this step leaves you with noticeably shorter talk time from day one.

Base station charge light staying off or showing error after fitting a new pack

NiMH packs drop to low resting voltages during warehouse storage — sometimes below 4.0V across the three cells. Some Avaya base stations have a minimum acceptance threshold and will not begin a charge cycle if the pack arrives below it. The fix is to briefly short-cycle the handset: press the talk key to draw a small load for 10–15 seconds, then reseat it in the base immediately. This nudges cell voltage just enough for the base to detect a valid pack and begin charging normally.

Talk time noticeably shorter than the original battery after the first few uses

NiMH cells do not deliver full rated capacity on the first one or two cycles — this is normal cell chemistry, not a defect. Full 700mAh capacity typically stabilises after three to five complete charge and discharge cycles. Run the handset down to the low-battery warning, then return it to the base for a full charge each time. By cycle five, talk time should match or exceed what the worn original pack provided.