{"product_id":"simplehuman-st3024-replacement-battery-37v-7800mah-li-ion","title":"Simplehuman ST3024 Replacement Battery 3.7V 7800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSimplehuman ST3024 \/ ST3026 \/ ST3027 \/ ST3028 Series — 3.7V Li-ion Replacement Battery (INR18650-3S1P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 7800mAh lithium-ion battery replaces the internal pack in Simplehuman sensor mirrors including the ST3024, ST3026, ST3027, and ST3028. It powers the motion-activated LED lighting and proximity sensor circuitry. Capacity figures are sourced from our product data — 7800mAh \/ 28.86Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eST3024–ST3028 shared platform:\u003c\/strong\u003e\n    These four mirror models use the same LED driver board and BMS handshake voltage. The INR18650-3S1P cell configuration matches the connector pinout and voltage rail required by the driver — swapping to a different cell count causes the driver to refuse startup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the Simplehuman LED driver circuit and confirmed the BMS allows full charge acceptance without triggering the over-voltage cutoff. The constant-current LED driver received stable voltage through the charge and discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge LED calibration:\u003c\/strong\u003e\n    After installing this battery, charge it fully before first use. The LED driver calibrates its constant-current output against cell voltage on the first session — a partially charged cell can cause uneven light output across the LED string until a full charge cycle completes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMakeup mirror LEDs dimming before the battery indicator shows low\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe LED driver in these Simplehuman mirrors runs a constant-current circuit, but it has a lower threshold — roughly 3.4V at the cell — where it begins reducing current to protect the battery. The visible result is a noticeable dimming well before the low-battery indicator triggers. This is not a fault with the new battery; it is the driver responding to sag under full LED brightness load. If dimming happens early in a session, check that the USB charger output is at least 5V 1A — an underpowered adapter leaves the cell partially charged and shrinks the usable voltage window.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMirror not charging via USB after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe charging circuit in these mirrors requires a minimum input voltage to begin current flow — most USB adapters rated below 5V\/1A will not satisfy the charge controller's threshold. After a battery swap, the new cell also starts at a lower state of charge than the original, which means the charge controller needs a clean, stable input to initialise. Confirm the adapter reads 5V on a USB meter or swap to a known-good 5V\/1A wall adapter. If the mirror still shows no charge indicator, hold the power button for 10 seconds to reset the BMS before retrying.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340114165850,"sku":"BWCS-SST302SL-1","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340114198618,"sku":"BWCS-SST302SL-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340114231386,"sku":"BWCS-SST302SL-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SST302SL-1.webp?v=1778367188","url":"https:\/\/batteryweb.com\/products\/simplehuman-st3024-replacement-battery-37v-7800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}