{"product_id":"biosystems-multipro-multigas-monitor-replacement-battery-37v-1800mah-li-polymer","title":"Biosystems MultiPro Multigas Monitor 3.7V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBiosystems MultiPro Multigas Monitor — 3.7V Li-Polymer Replacement Battery (54-49-107)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1800mAh lithium-polymer battery is a direct replacement for the Biosystems MultiPro Multigas Monitor. The MultiPro is a portable multi-gas detection instrument used in industrial safety inspections and confined space entry surveys. It fits alongside OEM part numbers 54-49-107 and 49-029.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMultiPro platform fit:\u003c\/strong\u003e\n    The MultiPro series uses a single-cell Li-Polymer pack at 3.7V nominal. The BMS communicates battery state directly to the monitor's firmware. Voltage tolerance matters here — cells outside the accepted window will trigger a battery fault flag before the device even boots.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the MultiPro's sensor initialisation sequence, which draws a short current spike as each gas sensor powers up. The BMS handled that spike without tripping into protection mode, and the monitor completed its warm-up cycle without interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePre-deployment calibration step:\u003c\/strong\u003e\n    After fitting this battery, run a full calibration cycle through the MultiPro's instrument menu before taking it into the field. The monitor maps battery state during calibration. Skipping this step causes the low-battery warning to trigger early during the first measurement session, even when the pack is fully charged.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS lockout after the MultiPro sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge slowly during storage. If the MultiPro sits unused long enough, the cell voltage drops below the BMS recovery threshold — typically around 2.5V for this chemistry. At that point the BMS locks the pack out entirely to prevent damage, and the monitor will not power on even when connected to a charger. To recover the pack, connect to a charger and leave it for at least 30–60 minutes before attempting to power the device on. If voltage has dropped below 2.0V, the pack will not recover and needs replacement.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings resetting or dropping out mid-logging session\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is not a sensor fault. Under sustained gas sensor load — particularly when the MultiPro is logging continuously across multiple gas channels — current draw is higher than during standby, and an aged or partially discharged cell can sag below the monitor's minimum operating voltage. The firmware interprets that voltage dropout as a power failure and resets the active session. If this happens, check the battery percentage before starting a logging session and ensure the pack is above 50% charge. A cell showing 100% at rest but sagging under load is a sign the pack has reached end of life.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360490225754,"sku":"BWCS-BSM107SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360490258522,"sku":"BWCS-BSM107SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360490291290,"sku":"BWCS-BSM107SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSM107SL-1.webp?v=1778615882","url":"https:\/\/batteryweb.com\/products\/biosystems-multipro-multigas-monitor-replacement-battery-37v-1800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}