Uniden YBT3N600MAH Cordless Phone Compatible Battery 3.6V 1200mAh

Uniden DX-AI5188 / EXAI-5160 / TRU-3455 Series — 3.6V Ni-MH Replacement Battery (YBT3N600MAH)

This is a 3.6V 1200mAh Ni-MH replacement battery for Uniden cordless handsets using part number YBT3N600MAH. It fits the DX-AI5188, EXAI-5160, EXAI-5180, TRU-3455, and four additional models in this family. The physical dimensions are 54.46 × 32.07 × 11.22mm — verify these against your existing pack before ordering.

• DX-AI5188 and EXAI series compatibility: These models share the same 3.6V three-cell Ni-MH pack format and connector orientation. The handset charging circuit targets the same voltage threshold across the whole family, so one battery spec covers all listed models.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT handset platform at 3.6V nominal. The BMS accepted charge correctly from a standard base station cradle, and the cell voltage settled at 4.3V at full charge without overrun.
• First-charge protocol for Ni-MH cordless packs: After installing this battery, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped in partial-discharge state need this slow initial charge to reach rated capacity — skipping it will make the first few cycles feel short.

Base station charging error light after installing a new Ni-MH pack

Uniden base stations use a voltage-sense circuit to confirm a battery is present before starting the charge cycle. A new Ni-MH pack stored for several months can sit below 3.0V — low enough that the base rejects it and flags an error. The fix is a short pre-charge: use a standalone Ni-MH charger at low current (around 50–100mA) to bring the pack above 3.2V, then reseat it in the base. Once the base detects a voltage in its acceptance window, the error light clears and normal charging resumes.

Range drops mid-call after a battery swap

Reduced range after fitting a new battery is usually a voltage-sag problem, not a pairing problem. DECT handsets maintain transmit power from the battery rail — when a partially conditioned Ni-MH pack sags under RF load, the transmitter pulls back and effective range shrinks. This clears after three to five full charge and discharge cycles, as the cells reach their rated 1200mAh capacity. If range is still short after five cycles, check that the handset is fully seated in the base between calls so the pack tops up to 4.3V.