{"product_id":"duracell-replacement-battery-108v-4000mah-ni-mh","title":"Duracell DR35 Replacement Battery 10.8V 4000mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDuracell DR35 \/ DR35S — 10.8V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 4000mAh (43.2Wh) Ni-MH replacement battery for laptops and notebooks that originally shipped with a Duracell DR35 or DR35S cell. It replaces a dead or degraded pack when the original can no longer sustain a charge. Voltage and connector match the DR35 and DR35S OEM spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDR35 and DR35S compatibility:\u003c\/strong\u003e\n    Both part numbers share the same 10.8V rail, physical form factor, and connector pinout. The BMS on each variant expects the same charge curve, so one cell covers both SKUs without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on Ni-MH compatible hardware. The BMS held charge termination correctly at full capacity and showed no false-peak cutoff on the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on Ni-MH:\u003c\/strong\u003e\n    After installing, run one full discharge to the hibernate cutoff point, then charge uninterrupted to 100%. Ni-MH cells need this full learn cycle to let the BIOS recalibrate its fuel gauge against the new pack — skipping it often triggers a persistent low-health warning.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the BIOS flags poor battery health immediately after swapping the DR35\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe BIOS stores battery health data in EEPROM on the old cell. When a new pack goes in, that EEPROM data is gone and the firmware reads the new cell as unknown or degraded. This is not a fault with the replacement battery — it is a firmware state issue. Running one complete discharge-to-hibernate followed by a full uninterrupted charge resets the learn cycle. After two to three full cycles, the reported health figure stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down abruptly at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet mapped the actual voltage curve of the new Ni-MH cell. The system trusts its old calibration data, calls 20–30% as the voltage floor, and cuts power. The fix is a deliberate full discharge — let the laptop run on battery until it hibernates on its own, then charge to 100% without interruption. Repeat this twice and the fuel gauge re-maps the curve; the cutoff point should drop to 5% or lower.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410860507226,"sku":"BWCS-DR35HB-1","price":84.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410860539994,"sku":"BWCS-DR35HB-2","price":100.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410860572762,"sku":"BWCS-DR35HB-3","price":111.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DR35HB-big.webp?v=1779581376","url":"https:\/\/batteryweb.com\/products\/duracell-replacement-battery-108v-4000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}