{"product_id":"merck-millipore-air-sampler-mas-100-replacement-battery-108v-1800mah-ni-cd","title":"Merck Millipore MAS-100 Air Sampler 10.8V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMerck Millipore Air Sampler MAS-100 — 10.8V Ni-CD Replacement Battery (110518-U)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V 1800mAh Ni-CD battery for the Merck Millipore MAS-100 portable microbial air sampler. It fits the MAS-100, MAS-AC-6009, and MAS-AC-7009 units used in pharmaceutical cleanrooms, hospital pharmacies, and controlled sterile environments. Capacity matches OEM at 1800mAh (19.44Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMAS-100 series compatibility:\u003c\/strong\u003e\n    The MAS-AC-6009 and MAS-AC-7009 share the same 10.8V three-cell Ni-CD architecture and connector pinout as the base MAS-100. All three models use the same BMS handshake protocol and charge termination logic, so one battery covers the full platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through the MAS-100 charge sequence and confirmed the BMS accepted the cell pack without fault codes. Charge termination triggered correctly at full capacity, and the device passed its post-charge self-test on the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this battery, let the MAS-100 complete its full power-on self-test without interruption. The BMS runs a verification routine at startup — cutting power during this window triggers a battery fault flag that persists until the next clean reboot cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MAS-100 BMS rejects a new Ni-CD cell on first contact\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MAS-100 charge controller uses delta-V peak detection tuned to a conditioned Ni-CD cell. A new, uncycled pack has a flatter voltage curve during the first charge, which can cause the controller to terminate early or flag a fault. This is not a defective battery — it is the charge IC applying conservative limits to an unfamiliar cell signature. One full charge-discharge cycle normalises the cell's internal resistance and delta-V response. After that cycle, the charge controller reads the pack correctly and accepts a full charge.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stalls below 100% after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA stalled charge indicator on the MAS-100 after a battery swap usually means the BMS has not yet completed its learn cycle on the new cell. Ni-CD cells from storage carry residual voltage, but their capacity profile is uncharacterised — the charge IC holds back until it maps the cell's actual charge acceptance curve. Run one uninterrupted full charge from below 20% to 100%, then discharge the unit through normal sampling use before recharging. After this single cycle, the indicator tracks accurately and the BMS updates its capacity registers.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381370683482,"sku":"BWCS-MAS100MD-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381370716250,"sku":"BWCS-MAS100MD-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381370749018,"sku":"BWCS-MAS100MD-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MAS100MD-1.webp?v=1778900448","url":"https:\/\/batteryweb.com\/products\/merck-millipore-air-sampler-mas-100-replacement-battery-108v-1800mah-ni-cd","provider":"BatteryWeb","version":"1.0","type":"link"}