{"product_id":"rae-systems-multirae-plus-replacement-battery-48v-2000mah-ni-mh","title":"RAE Systems MultiRAE Plus 4.8V Replacement Battery 500-0037-100","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRAE Systems MultiRAE Plus \/ PGM-50 — 4.8V Ni-MH Replacement Battery (500-0037-100)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V 2000mAh Ni-MH replacement battery for the RAE Systems MultiRAE Plus, MultiRAE Qrae, and PGM-50 portable multi-gas detectors. It replaces OEM parts 500-0037-100, CD500-0059-000-FRU, and 0059 0039 0037. The pack slots into the same battery compartment and connects to the same BMS handshake the instrument expects at power-up.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMultiRAE Plus, Qrae, and PGM-50 compatibility:\u003c\/strong\u003e\n    These three instruments share the same 4.8V four-cell NiMH pack format, connector pinout, and BMS communication protocol. A single battery revision covers all three because RAE Systems standardised the power rail across this detector family.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the PGM-50 power-up sequence and monitored the BMS handshake during sensor initialisation. The pack held voltage above the cutoff threshold during the electrochemical sensor warm-up draw and passed the instrument's internal battery check without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration cycle:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the instrument menu before field deployment. The MultiRAE maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during the first measurement session, even on a fully charged pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePGM-50 and MultiRAE Plus shutting down mid-survey with no warning\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the electrochemical sensor array draws a combined initialisation current that pushes the pack voltage below the BMS cutoff threshold — typically around 4.2V under load for a four-cell NiMH string. An aged original pack with degraded cells hits this threshold during the sensor polling cycle, not during idle. The instrument interprets the voltage drop as a dead battery and cuts power immediately. Replacing the pack and running a calibration cycle before the next field session resets the instrument's voltage-state map and stops the unexpected shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMultiRAE Qrae not recognising the new pack after long storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the instrument sat unused for several months with the original pack still installed, the cells may have self-discharged below the BMS recovery threshold — often under 4.0V for this pack format. The BMS enters a sleep state and the instrument either shows a battery error or fails to power on at all. Place the pack on the charger for a minimum 30-minute pre-charge pass before inserting it into the instrument. If the charger does not begin the charge cycle, hold it at a trickle input using a compatible NiMH charger set to 100mA until the pack recovers to 4.4V, then switch to normal charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360468238426,"sku":"BWCS-REM500SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360468271194,"sku":"BWCS-REM500SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360468303962,"sku":"BWCS-REM500SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-REM500SL-1.webp?v=1778615900","url":"https:\/\/batteryweb.com\/products\/rae-systems-multirae-plus-replacement-battery-48v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}