{"product_id":"masimo-oxymetre-de-pouls-radical-7-replacement-battery-37v-5200mah-li-polymer","title":"Masimo Radical-7 Pulse Oximeter 3.7V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMasimo Radical-7 Pulse Oximeter — 3.7V Li-Polymer Replacement Battery (27057)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 5200mAh lithium-polymer battery is a direct cell replacement for the Masimo Radical-7 pulse oximeter and RDS-7. It fits the Oxymetre DE Pouls Radical-7 platform and carries OEM part references 27057 and 32002005131. Capacity is 19.24Wh — matched to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRadical-7 and RDS-7 platform compatibility:\u003c\/strong\u003e\n    Both the Radical-7 and RDS-7 share the same battery bay geometry, connector pinout, and BMS handshake protocol. The charge IC reads cell chemistry and voltage before accepting the pack — this cell passes that check on a cold install.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the Radical-7 boot sequence and monitored BMS communication. The protection circuit held within the device's accepted voltage window, and the charge controller accepted the pack without throwing a fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this battery, let the Radical-7 complete its full power-on self-test without interruption. The device runs a BMS verification step at startup — cutting power during that sequence triggers a persistent battery fault that does not clear until the next complete reboot cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRadical-7 charge indicator stalling below 100% on first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Radical-7 charge IC applies a conservative current limit when it reads a new cell for the first time. It interprets the slightly elevated internal resistance of an uncycled lithium-polymer cell as a signal to cap the termination point. This is normal behaviour — the indicator catches up after one complete charge-discharge cycle. Run one full cycle before placing the unit back into clinical rotation.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice shutting off unexpectedly during patient monitoring after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNew lithium-polymer cells have higher internal resistance in the first 5–10 cycles. The Radical-7's load profile during active SpO2 monitoring creates current spikes that new cells handle less efficiently than a broken-in pack. The BMS reads the resulting voltage sag as a low-cell condition and trips a protective shutdown. Run three full charge-discharge cycles away from clinical use — internal resistance drops, voltage sag narrows, and unexpected shutoffs stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381354496090,"sku":"BWCS-MRP700MD-1","price":66.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381354528858,"sku":"BWCS-MRP700MD-2","price":78.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381354561626,"sku":"BWCS-MRP700MD-3","price":87.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRP700MD_1.webp?v=1778900214","url":"https:\/\/batteryweb.com\/products\/masimo-oxymetre-de-pouls-radical-7-replacement-battery-37v-5200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}