{"product_id":"medtronic-primedic-defi-b-replacement-battery-144v-2000mah-ni-mh","title":"Medtronic Primedic DEFI-B TB01020701 Replacement Battery 14.4V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMedtronic Primedic DEFI-B — 14.4V Ni-MH Replacement Battery (TB01020701)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V, 2000mAh Ni-MH replacement battery for the Medtronic Primedic DEFI-B portable external defibrillator. It replaces OEM part number TB01020701 and fits the DEFI-B unit used in emergency medical and ambulance settings. Voltage and capacity match the original specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrimedic DEFI-B compatibility:\u003c\/strong\u003e\n    The DEFI-B runs a proprietary BMS that handshakes with the battery pack at startup. This replacement uses the same 14.4V Ni-MH cell configuration and connector pinout, so the BMS recognises the pack and proceeds through its standard power-on sequence without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on the DEFI-B platform and monitored BMS communication through charge and discharge. The charge IC accepted the cell chemistry without modification, and the pack passed the device's internal self-test on the second full cycle after an initial conditioning run.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the DEFI-B to complete its full power-on self-test without interrupting the sequence. Medtronic's BMS runs a chemistry verification at boot — cutting power mid-sequence stores a false battery fault in memory that will persist 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\"\u003eWhy the DEFI-B self-test fails after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DEFI-B's BMS is calibrated to the charge curve of a conditioned OEM cell. A new replacement pack has not yet established its full charge profile, so the BMS may flag a chemistry mismatch on the first one or two cycles. This is not a fault with the battery — it is the BMS applying a conservative threshold it learned from the previous cell. Running one complete charge-discharge cycle lets the BMS recalibrate its learned parameters to the new pack. After that cycle, self-test results return to normal and the device clears any stored fault flags.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stops short of 100% on first charge after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge, the DEFI-B's charge IC applies a reduced termination current to an unrecognised cell — it reads the new pack as potentially over-capacity and backs off early. The result is a charge indicator that plateaus at roughly 85–90% and does not advance. Disconnect the charger, power on the device to draw the pack down to approximately 11V, then perform a full uninterrupted charge cycle. After this conditioning run the charge IC adjusts its termination threshold and the indicator will reach 100%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381516140634,"sku":"BWCS-MPD701MD-1","price":89.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381516173402,"sku":"BWCS-MPD701MD-2","price":105.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381516206170,"sku":"BWCS-MPD701MD-3","price":116.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MPD701MD-1.webp?v=1778901370","url":"https:\/\/batteryweb.com\/products\/medtronic-primedic-defi-b-replacement-battery-144v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}