Samsung WEP-200 Replacement Battery 3.7V 90mAh Li-Polymer

Samsung WEP-200 / WEP-210 / WE-P301 — 3.7V Li-Polymer Replacement Battery (481220)

This is a 3.7V, 90mAh Li-Polymer replacement battery for the Samsung WEP-200, WEP-210, and WE-P301 wireless Bluetooth headsets. It replaces OEM part numbers 481220, B481220, HS-2, and AHB601218. The cell fits the same housing and connects to the same circuit board as the original.

• WEP-200, WEP-210, and WE-P301 compatibility: These three headsets share the same cell footprint, connector pitch, and BMS handshake protocol — all three draw from the same 3.7V rail to power both the audio codec and the Bluetooth radio simultaneously.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the WEP-200 platform. The BMS accepted the new pack without fault codes, and the protection circuit tripped correctly at low-voltage cutoff during discharge testing.
• First-cycle base station logging: Seat the headset in the base station and run a complete charge cycle before taking a call. DECT and Bluetooth headsets in this range log the new cell's capacity during the first base-station cycle — the talk-time indicator will not read accurately until that cycle completes.

Why the WEP-200 cuts out mid-call on a new battery

The WEP-200 drives the Bluetooth radio and the audio codec at the same time. That combined draw creates brief current spikes the BMS treats as an undervoltage event if the cell is not fully charged. A new cell shipped at storage voltage — around 3.6V — sits close enough to the BMS cutoff threshold that a call-start spike can trip it. Run one full charge cycle in the base station before use. After that cycle the cell rests above 3.8V and the BMS no longer trips under normal combined draw.

Base station shows full charge but headset shuts off after a short call

This happens when the base station terminates its charge sequence based on voltage rather than a completed capacity log. The cell reaches nominal voltage quickly from storage charge, the base signals full, but actual stored capacity is well below rated. The fix is to let the headset drain fully during a call or audio playback, then seat it in the base for an uninterrupted charge until the indicator confirms completion. After one proper full cycle the base and headset align on capacity, and the cut-off behaviour stops.