{"product_id":"steelseries-nimbus-controller-replacement-battery-37v-750mah-li-polymer","title":"SteelSeries Nimbus Controller Compatible Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSteelSeries Nimbus \/ Stratus Duo \/ Nimbus+ — 3.7V Li-Polymer Replacement Battery (FT712257P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh lithium-polymer replacement battery for the SteelSeries Nimbus Controller, Stratus Duo, and Nimbus+. All three are wireless game controllers used with iOS, tvOS, and Mac devices. The FT712257P cell fits the shared internal battery slot across this controller family.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNimbus \/ Stratus Duo \/ Nimbus+ compatibility:\u003c\/strong\u003e\n    These three controllers share the same PCB layout, battery connector, and BMS handshake protocol. The FT712257P format — 51.50 × 20.00 × 7.00mm — fits all three bays without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a Nimbus controller under active wireless pairing and button polling load. The BMS held a stable charge curve through cutoff and accepted a full recharge from flat without tripping protection.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge conditioning after install:\u003c\/strong\u003e\n    On first use, run one complete wireless play session to full automatic cutoff before recharging. The Nimbus fuel gauge IC sets its empty reference point against the first full discharge cycle — skipping this step causes the indicator to read inaccurately for weeks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNimbus controller disconnecting before the battery indicator reaches empty\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nimbus wireless stack and any active rumble motor draw current simultaneously. Under that combined load, a degraded or new unconditioned cell sees a voltage sag that briefly pulls the supply rail below the BMS disconnect threshold. The controller reads this as a fault and drops the Bluetooth link — even though the indicator still shows charge remaining. This is not a firmware bug. After 3–5 full conditioning cycles, internal resistance drops and the sag narrows. If disconnects persist past five cycles, check that the battery connector is fully seated, as a loose contact amplifies the sag under load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFuel gauge jumping or freezing on the Nimbus after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nimbus uses a coulomb-counting fuel gauge IC that tracks charge and discharge against a stored discharge curve from the original cell. A new cell has a different internal resistance profile, so the IC's model no longer matches actual capacity. You'll see the indicator jump — typically from full to half — or freeze at one level for an extended period. This resolves itself after the IC re-learns the new cell's curve across 3–5 full cycles. Do not judge the replacement battery's condition until at least three full discharge-recharge cycles are complete; the gauge reading before that point is not reliable.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377535123546,"sku":"BWCS-SLC712SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377535156314,"sku":"BWCS-SLC712SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377535189082,"sku":"BWCS-SLC712SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SLC712SL-1.webp?v=1778767243","url":"https:\/\/batteryweb.com\/products\/steelseries-nimbus-controller-replacement-battery-37v-750mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}