Binatone iDect X2i Replacement Battery 3.7V 500mAh

Binatone iDect X2i Series — 3.7V Li-Polymer Replacement Battery (MT LP053040)

This 3.7V 500mAh Li-Polymer cell replaces the MT LP053040 battery in the Binatone iDect X2i, iDect X2i Single, and iDect X2i Twin cordless handsets. It matches the original cell's dimensions (41.90 × 29.24 × 5.07mm), voltage, and connector. Fit this when the handset no longer holds a useful charge or stops powering on entirely.

• iDect X2i handset family: The Single and Twin variants use the same slim Li-Polymer cell on the same 3.7V rail with the same connector orientation. One part number covers all three — no wiring modification needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the X2i handset. The protection circuit tripped correctly at low-voltage cutoff and accepted a full charge without overtemperature events.
• First charge after installation: Li-Polymer cells in DECT handsets ship at storage charge, not full capacity. Seat the handset in the base immediately after fitting and leave it for a full charge cycle before making calls — this lets the cell reach its rated 500mAh capacity from the outset.

Why the iDect X2i loses range when the battery ages

DECT transmit power depends on stable voltage from the cell. As a Li-Polymer cell ages, internal resistance rises and voltage sags under the RF transmit load — even if the handset idles fine on the base. The radio drops power to compensate, which shortens effective range before the battery reads as low. Fitting a fresh cell with lower internal resistance restores the voltage headroom the transmitter needs.

Handset not pairing with base after battery replacement

Removing the old battery cuts all power to the handset, and some iDect DECT handsets lose their base pairing when power is fully interrupted. The fix is a manual re-registration: hold the handset's paging or registration button, then trigger registration from the base station menu. Consult the base station label — the default PIN is usually 0000. Once paired, the handset reconnects and operates normally.