NEC 0381301 Cordless Phone Replacement Battery 3.7V 1800mAh

NEC 0381301 / MH150 Series — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1800mAh Li-ion replacement battery for NEC cordless DECT handsets. It fits the 0381301, 0381325, MH150, and MH160 models. The physical dimensions are 61.90 × 38.00 × 14.20mm — measure your original before ordering if you are unsure.

• 0381301, 0381325, MH150, MH160 compatibility: These four handsets share the same battery bay dimensions, 3.7V nominal rail, and connector orientation. The cell slot and contact spacing are identical across the range, so one battery fits all four without modification.
• Bench tested on actual hardware: We cycled this battery on the MH150 handset platform. The protection circuit handled charge termination cleanly and the BMS held voltage above the handset's low-battery cutoff threshold through full discharge cycles.
• First charge after installation: Seat the handset in the base cradle immediately after fitting this battery and leave it there for a full 16 hours before first use. Li-ion cells shipped in storage state need one complete slow charge to calibrate the handset's charge indicator accurately.

Talk time shorter than expected after fitting the new battery

A Li-ion cell arriving from storage holds a partial charge — typically 40–60% — and the handset's fuel gauge has no reference point yet. The first two to three full charge-and-use cycles let the BMS recalibrate its capacity tracking. Until those cycles complete, the handset will show low battery earlier than the rated capacity justifies. Run three full charge cycles from the base cradle before judging actual talk time.

Handset loses DECT pairing after battery replacement

Removing the old battery cuts all power to the handset, and several NEC DECT models store their base station pairing in volatile memory. When power drops to zero, that pairing data clears. The fix is to re-register the handset to the base — press and hold the FIND or PAGE button on the base unit until the handset enters registration mode. Consult your base station label for the default PIN, which is usually 0000 on NEC units.