{"product_id":"eppendorf-response-model-4850-replacement-battery-6v-150mah-ni-mh","title":"Eppendorf Response 4850 Pipette Controller Compatible Battery 6V 150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEppendorf Response Model 4850 — 6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V 150mAh Ni-MH rechargeable cell for the Eppendorf Response Model 4850 motorized pipette controller. It replaces the internal battery that powers the motor drive and control electronics in this lab liquid-handling device. Dimensions are 30.00 × 24.72 × 14.26 mm — confirm these against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eResponse Model 4850 fit:\u003c\/strong\u003e\n    The 4850 uses a single compact Ni-MH pack at 6V to run both the aspiration motor and the onboard control logic. Voltage and physical footprint must match exactly — swapping chemistry or size breaks the charge circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the 4850's charge and discharge profile. The BMS accepted the cell without fault flags, and the charge IC brought the pack to full without triggering over-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePower-on self-test protocol:\u003c\/strong\u003e\n    After fitting this cell, let the 4850 complete its full startup self-test without interrupting power. The device runs a BMS verification pass at boot — cutting power mid-sequence locks in a false battery fault that won't clear until the next clean reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 4850 charge indicator stalls below 100% on a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 4850's charge IC applies a conservative current limit when it detects a cell with low initial voltage — typical on a new Ni-MH pack that has partially self-discharged in storage. The IC interprets the slow voltage rise as a degraded cell and caps the charge termination point early. Run one full charge-discharge cycle after first installation. On the second charge, the IC recalibrates its delta-V cutoff and the indicator reaches 100% correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice won't power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day in storage. If this battery has been sitting for several weeks before fitting, its resting voltage may be below the 4850's BMS recovery threshold — typically around 4.8V for a 6V pack. The BMS refuses to boot rather than risk operating with an undercharged cell. Place the device on charge for a full uninterrupted cycle before attempting power-on; the charger will recover the cell from low-voltage state before the BMS re-enables the power rail.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381502476378,"sku":"BWCS-BPE302MD-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381502509146,"sku":"BWCS-BPE302MD-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381502541914,"sku":"BWCS-BPE302MD-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BPE302MD-1.webp?v=1778901304","url":"https:\/\/batteryweb.com\/products\/eppendorf-response-model-4850-replacement-battery-6v-150mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}