About this replacement
Simplehuman ST3007 / ST3011 / ST3024 — 3.7V Li-ion Replacement Battery (SH02)
This is a 3.7V Li-ion cell rated at 7800mAh (28.86Wh), built to replace the original SH02 battery in Simplehuman lighted cosmetic mirrors. It fits the ST3007, ST3011, and ST3024 models. The battery powers the LED lighting array and the touchless sensor activation circuit in all three mirrors.
- ST3007, ST3011, ST3024 compatibility: All three mirrors share the same 3.7V single-cell architecture, SH02 connector pinout, and LED driver circuit. The BMS handshake is identical across the range, so one cell covers all three models without modification.
- Bench tested on actual hardware: We ran this cell through the ST3007's LED driver and sensor circuit. The BMS negotiated charge termination correctly at full capacity, and the constant-current LED driver held stable output from a full charge down to the low-voltage cutoff threshold.
- First-charge LED calibration: After installing this cell, charge it fully before switching the mirror on. The LED driver measures cell voltage on first activation to set its constant-current baseline. A partial charge at first use can leave the driver under-calibrated, causing uneven light output across the LED ring that persists until a full charge cycle is completed.
Makeup mirror LEDs dimming before the battery indicator shows low
The ST3007's LED driver pulls constant current from the cell. As the cell ages and internal resistance rises, voltage sags under load even when the battery gauge still reads mid-range. The driver interprets that voltage drop as a brownout condition and steps down current to protect the LEDs. The result is visible dimming well before the low-battery indicator triggers. A fresh cell with low internal resistance eliminates the sag, and full brightness holds across the usable charge range.
Mirror not charging via USB after a battery swap
The ST3007 charging circuit requires a USB adapter that can sustain at least 5V at 1A continuously. A low-output adapter or a worn cable drops below the minimum input threshold mid-charge, causing the charge controller to reset and the charging LED to cut out. This looks like a faulty battery but the cell is not the cause. Test with a known-good 5V/1A or higher USB adapter — the charge indicator should light immediately and stay on.