{"product_id":"hitachi-dz-mv730a-replacement-battery-74v-750mah-li-ion","title":"Hitachi DZ-BP7SJ Compatible Battery 7.4V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHitachi DZ-MV730A Series — 7.4V Li-ion Replacement Battery (DZ-BP7SJ)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 750mAh Li-ion battery replaces the DZ-BP7SJ and six other OEM part numbers across the Hitachi DVD camcorder range. It fits the DZ-MV730A, DZ-MV580A, DZ-MV750, DZ-M8000V6, and over 70 additional Hitachi models. Same voltage rail, same connector, same BMS handshake as the factory cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model fit across the Hitachi DVD camcorder platform:\u003c\/strong\u003e\n    The DZ-MV and DZ-M lines share a common battery bay geometry and 7.4V power rail. OEM part numbers DZ-BP07PW, DZ-BP07P, DZ-BP7S, DZ-BP07S, DZ-BP7SW, CGR-DU06E\/1B, and DZ-BP7SJ all cross to this cell. The connector orientation and BMS communication protocol are identical across this platform generation.\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 a DZ-MV series body. The BMS accepted the replacement without error flags, and the battery-remaining indicator tracked consistently through the discharge curve from first use after one full charge cycle in the camera body.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use cycle on the DZ-MV730A:\u003c\/strong\u003e\n    Run one complete charge cycle through the camera body or OEM charger before shooting. The DZ-MV series BMS maps its battery-remaining display against a stored discharge curve — skipping this step can cause the indicator to read inaccurately during early sessions.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDead battery indicator on a partially charged replacement cell in the DZ-MV series\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DZ-MV730A uses a voltage-threshold system to estimate remaining charge. A new cell that has not completed its first calibration cycle can sit at 7.2V and still trigger the low-battery warning because the camera's stored curve doesn't yet match the new cell's discharge profile. This is not a fault with the replacement — it is the BMS reading an unrecognised curve. One full charge via the OEM charger or in-body charging resets the threshold mapping and resolves the false warning. After that cycle, the indicator tracks correctly from 8.4V fully charged down to the 6.0V cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically during recording on the DZ-MV730A\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the DZ-MV730A's display shows percentage values jumping — for example, from 60% to 20% and back — the cause is a mismatch between the camera's stored discharge curve and the new cell's actual voltage-to-capacity relationship. The camera samples terminal voltage at intervals and maps it to a fixed internal table calibrated to the original cell's chemistry batch. A replacement cell with a slightly different internal resistance will produce voltage readings that land in the wrong table bracket under load. Performing one full charge-discharge cycle through the camera body re-anchors the threshold mapping to the replacement cell's actual curve, and the percentage display stabilises from that point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333896634458,"sku":"BWCS-VBD070-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333896667226,"sku":"BWCS-VBD070-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333896699994,"sku":"BWCS-VBD070-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VBD070-1.webp?v=1778213591","url":"https:\/\/batteryweb.com\/products\/hitachi-dz-mv730a-replacement-battery-74v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}