{"product_id":"ctx-ez-book-800-series-replacement-battery-12v-3800mah-ni-mh","title":"CTX EZ Book 800 Series DR36 12V Replacement Battery 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCTX EZ Book 800 Series — 12V Ni-MH Replacement Battery (DR36)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V 3800mAh (45.6Wh) Ni-MH replacement battery for the CTX EZ Book 800 Series notebook. It replaces OEM part numbers DR36 and DR36S. When the original cell degrades and can no longer hold a usable charge, this unit restores portable operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEZ Book 800 Series compatibility:\u003c\/strong\u003e\n    These notebooks share a common 12V Ni-MH battery rail with a fixed connector pinout across the 800 Series range. The BMS handshake expects the DR36 voltage profile — this replacement matches that profile exactly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through full charge and discharge on EZ Book 800 hardware. The BMS accepted the cell without fault codes, and charge termination triggered correctly at capacity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle conditioning on Ni-MH:\u003c\/strong\u003e\n    Ni-MH cells in laptop applications can develop voltage depression if the first few cycles are partial. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears inaccurate health warnings that commonly appear after a cell 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 EZ Book 800 BIOS reports poor battery health after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe BIOS stores battery health data in EEPROM from the previous cell. When a new battery is installed, the BIOS compares live readings against that stored profile and flags a mismatch as poor health. This is not a fault with the replacement cell — it is stale EEPROM data. Running a full discharge-to-hibernate followed by an uninterrupted charge-to-100% triggers the BIOS battery learn cycle and overwrites the old profile. After two to three full cycles, the health indicator should normalise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFuel gauge reading wildly inaccurate for the first few charge cycles\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the EZ Book 800 Series calibrates itself against the cell it has learned over time. A new cell with fresh capacity throws off those learned reference points, causing the gauge to report erratic percentages — jumping from 60% to 15% without warning. The IC needs two to three full discharge-and-charge cycles to recalibrate against the new cell's actual voltage curve. Do not judge the replacement battery's condition until at least three full cycles are complete. After calibration, the gauge should track consistently from 12V down to the hibernate cutoff.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410856935514,"sku":"BWCS-DR36HB-1","price":89.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410856968282,"sku":"BWCS-DR36HB-2","price":105.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410857001050,"sku":"BWCS-DR36HB-3","price":118.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DR36HB-big.webp?v=1779581376","url":"https:\/\/batteryweb.com\/products\/ctx-ez-book-800-series-replacement-battery-12v-3800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}