{"product_id":"meder-smartguide-2-replacement-battery-38v-3900mah-li-polymer","title":"Meder SmartGuide 2 Replacement Battery 3.8V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMeder SmartGuide 2 \/ SmartGuide 210-464 — 3.8V Li-Polymer Replacement Battery (AHB466684)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V 3900mAh Li-Polymer battery replaces the original AHB466684 cell in the Meder SmartGuide 2 and SmartGuide 210-464 smartphones. It restores power to the display, processor, modem, and all onboard connectivity. Dimensions are 85.20 × 63.50 × 4.50mm — measure your original cell before installing to confirm fit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSmartGuide 2 and 210-464 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell covers the full range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the SmartGuide platform. The BMS accepted the cell, charge termination triggered correctly at 4.35V, and protection cut-off activated as expected at the low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging pushes into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the SmartGuide 2 after cell replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff failure. Under modem transmission or screen brightness peaks, the new cell momentarily drops below the BMS low-voltage threshold even though the fuel gauge still reads 20–30%. The OS doesn't see the voltage drop in time — the BMS cuts power before a clean shutdown. Running one full discharge to automatic cutoff, then a full charge without fast charging, teaches the coulomb counter where the real voltage floor sits and eliminates most spontaneous shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSmartGuide 2 shows erratic or jumping battery percentage after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC in the SmartGuide 2 stores a learned discharge curve from the original cell. A new cell with a different internal impedance profile makes the IC's estimates unreliable — percentage can jump 10–15 points in either direction. The fix is one full uninterrupted discharge from 100% to automatic shutoff, followed by a full charge to 100%. After that cycle the coulomb counter resets its reference points against the actual cell and percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391816204378,"sku":"BWCS-MSG210SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391816237146,"sku":"BWCS-MSG210SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391816269914,"sku":"BWCS-MSG210SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MSG210SL-1.webp?v=1779142222","url":"https:\/\/batteryweb.com\/products\/meder-smartguide-2-replacement-battery-38v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}