{"product_id":"microsoft-surface-a70-replacement-battery-77v-6200mah-li-polymer","title":"Microsoft Surface A70 Replacement Battery 7.7V 6200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMicrosoft Surface A70 — 7.7V Li-Polymer Replacement Battery (823-00088-01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.7V, 6200mAh (47.74Wh) lithium-polymer replacement battery for the Microsoft Surface A70 tablet. It matches the OEM part number 823-00088-01 and fits the original battery slot without modification. Replace this when the existing cell no longer holds a charge or causes the tablet to shut down unexpectedly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSurface A70 fitment:\u003c\/strong\u003e\n    The A70 uses a flat Li-Polymer cell with a specific connector orientation and BMS handshake tied to the Surface charge IC. This replacement carries the matching 823-00088-01 specification so the charge controller recognises the cell and does not block charging.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on the Surface A70 platform. The BMS accepted the cell without fault codes, and the charge IC completed a full cycle without thermal cutoff or negotiation errors.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After installation, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell capacity and clears the inaccurate percentage readings that appear immediately after a battery swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSurface A70 shutting down at 15–25% remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still calibrated to the old, degraded cell. When the display and WiFi radio pull current simultaneously, voltage sags faster than the gauge expects, and the system reads 0V before the percentage hits zero. The tablet interprets this as a dead battery and cuts power. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% realigns the gauge to the new cell's actual voltage curve. After that cycle, shutdowns at 15–25% stop occurring.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging not available after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Surface A70 charge IC uses a USB-PD negotiation step that requires at least one completed charge cycle before it unlocks higher wattage delivery to a new cell. Until that cycle runs, the tablet charges at base wattage only. Plug in with the original Surface charger, let it charge fully without interruption, and do not disconnect early. After that first complete cycle, USB-PD negotiation resumes normally and fast charge becomes available again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43425836433498,"sku":"BWCS-MCA700SL-1","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43425836466266,"sku":"BWCS-MCA700SL-2","price":89.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43425836499034,"sku":"BWCS-MCA700SL-3","price":98.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MCA700SL-1.webp?v=1779929903","url":"https:\/\/batteryweb.com\/products\/microsoft-surface-a70-replacement-battery-77v-6200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}