{"product_id":"toitu-fd390-doppler-replacement-battery-96v-700mah-ni-mh","title":"Toitu FD390 Doppler 9.6V Ni-MH Replacement Battery 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToitu FD390 Doppler — 9.6V Ni-MH Replacement Battery (6075)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9.6V, 700mAh Ni-MH replacement battery for the Toitu FD390 Doppler ultrasound device. It fits both the FD390 Doppler and FD390 model variants. The battery powers the unit during portable clinical examinations where AC power is not available.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFD390 and FD390 Doppler compatibility:\u003c\/strong\u003e\n    Both variants share the same voltage rail, connector pinout, and BMS handshake protocol. The 6075 part number covers both. No adapter or modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the FD390 platform. The BMS accepted the cell without fault codes, completed the handshake, and reported state of charge accurately after the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePower-on self-test after installation:\u003c\/strong\u003e\n    After fitting this battery, allow the FD390 to complete its full startup self-test without interruption. Medical device BMS firmware runs a verification sequence at boot. Cutting power during that sequence locks in a false battery fault 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 FD390 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe FD390 charge IC applies a conservative capacity threshold calibrated to the original OEM cell's charge profile. A new replacement cell has not yet established its internal resistance baseline, so the BMS reads the voltage curve as below threshold even when the cell is fully charged. This is not a faulty battery. Run one complete charge-discharge cycle and the BMS recalibrates its threshold to match the new cell. After that cycle, the low-battery alarm clears and state-of-charge reporting normalises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFD390 will not power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day in storage. If the cell dropped below approximately 8.5V before installation, the FD390's BMS recovery threshold blocks startup to protect downstream circuitry. Place the battery on charge for a minimum of 30 minutes before attempting to power the device. Once the cell climbs above the recovery voltage, the BMS re-initialises and the unit boots normally. If the device still does not power on after a 60-minute charge, check the charger output at the connector — it should read between 10.5V and 12V under no load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381509095514,"sku":"BWCS-LFD390MD-1","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381509128282,"sku":"BWCS-LFD390MD-2","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381509161050,"sku":"BWCS-LFD390MD-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LFD390MD-1.webp?v=1778901340","url":"https:\/\/batteryweb.com\/products\/toitu-fd390-doppler-replacement-battery-96v-700mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}