{"product_id":"insignia-flex-ns-replacement-battery-37v-4000mah-li-polymer","title":"Insignia Flex NS Replacement Battery 3.7V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eInsignia Flex NS \/ P08A7100 — 3.7V Li-Polymer Replacement Battery (PR-3797103)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 4000mAh lithium-polymer cell matching OEM part number PR-3797103. It fits the Insignia Flex NS and P08A7100 tablets. Install it when the original cell no longer holds a useful charge or the tablet shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFlex NS and P08A7100 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and charge IC handshake. The PR-3797103 footprint — 105.90 × 99.40 × 3.50mm — is consistent across both board revisions, so one part number covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the battery through a full charge cycle on a Flex NS unit and monitored BMS communication. The charge IC accepted the cell without fault codes, and protection thresholds — overcurrent, overvoltage, and temperature cutoff — all triggered at expected values.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After fitting this battery, run the tablet down to automatic shutoff, then charge it uninterrupted to 100%. This forces the fuel gauge IC to calibrate against the new cell's actual capacity curve and clears the inaccurate percentage readings that almost always appear right after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Flex NS shuts down at 15–25% after a battery replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Flex NS fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches actual voltage behaviour. The tablet sees the new cell's voltage drop at the low end and interprets it as a critical shutdown threshold, even though real capacity remains. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets the learned curve. After that cycle, shutdowns at inflated percentages stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging unavailable on the Flex NS after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Flex NS charge controller negotiates charge rate partly based on cycle data it associates with the installed cell. Immediately after a swap, the controller defaults to a conservative charge rate until it completes one accepted full cycle. This is not a fault with the replacement battery. Plug the tablet in with the manufacturer's charger and let it complete one full charge to 100% without interruption — fast charge capability restores after that first accepted cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43425839841370,"sku":"BWCS-SAT710SL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43425839874138,"sku":"BWCS-SAT710SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43425839906906,"sku":"BWCS-SAT710SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SAT710SL-1.webp?v=1779929976","url":"https:\/\/batteryweb.com\/products\/insignia-flex-ns-replacement-battery-37v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}