{"product_id":"ohmeda-7800-replacement-battery-48v-3600mah-ni-mh","title":"Ohmeda 7800 Replacement Battery 4.8V 3600mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOhmeda 7800 \/ 7810 Anesthesia Ventilator — 4.8V Ni-MH Replacement Battery (MED9125)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V 3600mAh Ni-MH replacement battery for the Ohmeda 7800 and 7810 anesthesia ventilator series. It powers the control electronics and monitoring functions during anesthesia administration. OEM part numbers MED9125, OM10788, and B10788 all cross to this cell pack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e7800 and 7810 platform fit:\u003c\/strong\u003e\n    Both models share the same 4.8V battery rail, connector pinout, and BMS handshake protocol — one cell pack covers the full series without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the 7800's power-on self-test and monitored BMS communication at each stage. The charge IC accepted the cell and voltage reporting stayed within the device's expected window across the full charge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the 7800 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — interrupting it before completion triggers a false battery fault that persists 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 7800 shows a battery fault after the first charge cycle\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 7800's BMS uses a threshold-based self-test calibrated to the OEM cell's charge signature. A new replacement cell — even fully charged — can read outside that learned window on the first cycle. This is a chemistry recognition issue, not a defective battery. One full charge-discharge cycle allows the BMS to map the new cell's internal resistance and voltage curve. After that cycle, the fault clears and the device reports battery status normally.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator not reaching 100% on the first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn first charge, the 7800's charge IC applies a conservative current limit to an unrecognised cell — this is standard behaviour for medical-grade charge controllers protecting against overvoltage on an unknown pack. The indicator will plateau below 100% and hold there. Run the battery down to the low-battery alarm threshold, then charge uninterrupted to full. After this conditioning cycle, the charge IC accepts the cell's full 3600mAh capacity and the indicator reads correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381508374618,"sku":"BWCS-GVM780MD-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381508407386,"sku":"BWCS-GVM780MD-2","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381508440154,"sku":"BWCS-GVM780MD-3","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GVM780MD-1.webp?v=1778901305","url":"https:\/\/batteryweb.com\/products\/ohmeda-7800-replacement-battery-48v-3600mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}