Skull Gold 4-Head Shaver Compatible Battery 3.7V 1600mAh

Skull Gold 4-Head Shaver — 3.7V Li-ion Replacement Battery

This 3.7V, 1600mAh Li-ion battery replaces the original cell inside the Skull Gold 4-head rotary shaver. It fits directly into the shaver housing and restores power to the multi-head cutting mechanism. No OEM part number is published for this model — match by physical dimensions: 50.00 × 18.50 × 18.20mm.

• Skull Gold 4-head shaver fit: The 4-head layout draws simultaneous power across multiple rotary motors. The battery's 3.7V nominal output and 1600mAh capacity match the original cell's voltage rail, so the shaver's speed controller reads accurate charge state from the first use.
• Bench tested on actual hardware: We cycled this cell through full charge and load discharge on the bench. The BMS held cutoff correctly at low voltage and accepted charge without triggering protection mode — no false fault flags reported by the shaver's indicator.
• Port drying before charge: The Skull Gold 4-head shaver is used near water daily. Before connecting the charger, dry the charging port completely with a cloth and let it air for two minutes. Moisture bridging the charging contacts triggers a BMS protection trip the shaver displays as a dead battery — not a charging error.

Capacity fade from daily partial charging on the Skull Gold shaver

Li-ion cells in compact shavers degrade faster when cycled in shallow bands — charged every morning before the battery drops below 50%. Each partial cycle counts toward total cycle life, and the cell's full capacity shrinks over time. The shaver's charge indicator calibrates against the original capacity, so a faded cell causes the indicator to read full quickly and drop to empty faster than expected. Replacing the cell resets that drift and restores accurate state-of-charge reporting.

Shaver motor speed dropping before the indicator shows low

Under the load of four rotary heads, the battery's voltage sags momentarily with each cutting stroke. As the cell ages, internal resistance rises and that sag deepens — the motor slows noticeably while the indicator still shows two bars or more. The BMS has not yet reached cutoff voltage, so the device reports no fault. Fitting a new cell with lower internal resistance eliminates the sag and restores consistent motor speed across the full discharge cycle.