Arcitec RQ1060 Replacement Battery 3.7V 750mAh Li-ion

Arcitec RQ1060 / RQ1090 / RQ1250 — 3.7V Li-ion Replacement Battery

This 3.7V 750mAh Li-ion battery replaces the internal cell in Arcitec rotary shavers including the RQ1060, RQ1090, RQ1250, and PT920/21. It slots into the same cell position as the factory unit, connecting to the same BMS board. No OEM part number is published for this cell — the fit is confirmed by voltage, physical dimensions (49.60 × 14.76 × 14.76mm), and connector spec.

• RQ1060 / RQ1090 / RQ1250 platform: These models share the same internal cell cavity, BMS architecture, and charging circuit. A single replacement cell spec covers the full range — voltage rail and connector pinout are identical across all four fit models listed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the RQ1060 chassis. The BMS accepted the cell without fault codes, held charge correctly, and released current to the motor without triggering premature cutoff under normal rotary load.
• Wet-shave charging precaution: If you rinse the shaver head under running water, let the housing air-dry for at least 30 minutes before placing it on the charging dock. Moisture sitting in the charging port bridges the contacts, and the BMS reads that as a protection fault — the shaver appears dead rather than wet.

Capacity fade from daily partial charging on the RQ1060

Shavers used twice daily and topped up on the dock every morning rarely complete a full discharge cycle. Li-ion cells in shallow-cycle patterns lose accurate state-of-charge calibration over time — the indicator stays green longer than the actual charge warrants. The BMS's fuel gauge drifts because it never sees a reference point at the bottom of the curve. Running the shaver to full cutoff once every three to four weeks resets that reference and keeps indicator readings accurate.

Motor speed dropping before the indicator shows low

When the battery cell degrades, its internal resistance rises. Under the rotary motor's load, voltage sags faster than the BMS's state-of-charge model predicts — the motor slows noticeably while the indicator still shows charge remaining. This is voltage sag under load, not an indicator fault. A fresh cell at 3.7V nominal eliminates the resistance gap that causes the sag. After fitting the replacement, confirm the cell charges to 4.2V at full capacity before first use.