{"product_id":"samsung-galaxy-watch-active2-40mm-replacement-battery-385v-220mah-li-polymer","title":"Samsung Galaxy Watch Active2 40mm Replacement Battery EB-BR830ABY 3.85V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy Watch Active2 40mm — 3.85V Li-Polymer Replacement Battery (EB-BR830ABY)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 220mAh Li-Polymer cell replaces the original battery in the Samsung Galaxy Watch Active2 40mm (SM-R830, SM-R835). It restores power to the display, processor, heart rate sensor, and wireless radio. Capacity matches the OEM specification — no capacity inflation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-R830 and SM-R835 fitment:\u003c\/strong\u003e\n    Both the Wi-Fi-only SM-R830 and the LTE SM-R835 use the same 22.00 × 20.60 × 4.90mm cell with the same connector and BMS handshake. The LTE variant draws more current from the modem rail, but the cell spec is identical across both SKUs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the SM-R830 platform. The BMS accepted the cell without fault flags, fuel gauge initialised correctly after a full charge cycle, and the watch reported battery percentage normally.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap charge cycle on the Active2:\u003c\/strong\u003e\n    After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before first use. The fuel gauge IC on the Active2 loses its reference point when the original cell is removed. Without a full charge cycle from near-zero, the percentage readout will be inaccurate for the first several days.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Active2 reports 0% and shuts down immediately after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Active2 uses a coulomb-counting fuel gauge IC that tracks charge by measuring current flow over time. When the cell is physically removed, that count resets to an undefined state — the IC has no reference for where the new cell sits on its charge curve. The watch reads this as 0% and triggers a low-battery shutdown before the display even fully loads. This is not a fault with the replacement cell. Placing the watch on the charger immediately after reassembly and completing a full charge to 100% resets the fuel gauge to a known anchor point.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eActive2 draining to empty within a single day after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell on a fresh impedance profile draws differently from the wear-conditioned original, and the Active2's power manager needs one to two charge cycles to recalibrate its draw estimates. Always-on display mode combined with continuous heart rate monitoring pulls the highest sustained current this 220mAh cell handles — both features active simultaneously account for the steepest drain curves we recorded on the bench. If single-day drain continues past three full charge cycles, check whether background app refresh or always-on display was re-enabled during the Tizen OS restart that follows a power interruption. Disable always-on display in Watch Settings → Display and retest.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416165941338,"sku":"BWCS-SMR830SH-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416165974106,"sku":"BWCS-SMR830SH-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416166006874,"sku":"BWCS-SMR830SH-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMR830SH-1.webp?v=1779760565","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-watch-active2-40mm-replacement-battery-385v-220mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}