{"product_id":"sigma-dp1q-replacement-battery-74v-1000mah-li-ion","title":"Sigma BP-51 7.4V Camera Replacement Battery DP1Q 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSigma DP1Q \/ DP2Q \/ DP3Q — 7.4V Li-ion Replacement Battery (BP-51)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BP-51 is a 7.4V, 1000mAh Li-ion cell for the Sigma DP-Q series compact cameras. It fits the DP1Q, DP2Q, and DP3Q bodies, all of which share the same battery bay geometry and BMS communication protocol. Capacity is drawn from product data: 1000mAh \/ 7.4Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDP1Q, DP2Q, and DP3Q compatibility:\u003c\/strong\u003e\n    All three cameras use the same BP-51 form factor, voltage rail, and connector pinout. The BMS handshake is identical across the Q-series, so one cell works in all three bodies without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the DP-Q charging circuit and confirmed the BMS accepted the cell, reported charge state, and held voltage through a full discharge profile consistent with the 7.4V nominal rail.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use charge cycle on the DP-Q body:\u003c\/strong\u003e\n    Run the first full charge through the camera body or OEM charger before shooting. The DP-Q BMS maps its battery-remaining display against a charge curve it records on the first cycle — skipping this step causes the indicator to read inaccurately from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the DP-Q series shows a dead battery indicator on a partially charged replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DP-Q bodies use a voltage-threshold system to estimate remaining charge. A new cell's discharge curve may not align with what the camera expects at each threshold point on the first few cycles. This causes the indicator to drop to zero — or flash the dead battery icon — well before the cell is actually empty. After one or two full charge-discharge cycles through the camera body, the BMS recalibrates and the indicator tracks correctly. Do not assume the cell is faulty if this happens on day one.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically on the DP-Q display\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the percentage readout skips — say, from 60% to 30% in a few frames — the camera's charge estimation is misreading the new cell's discharge curve. This is a mapping issue, not a cell fault. The fix is a full charge from zero to 100% inside the camera body, which forces the BMS to re-index its voltage-to-percentage table. After that cycle, charge the cell to 4.2V per cell (8.4V total at the pack terminals) and confirm the readout stabilises before shooting.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333752127578,"sku":"BWCS-BLC12MX-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333752160346,"sku":"BWCS-BLC12MX-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333752193114,"sku":"BWCS-BLC12MX-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLC12MX-1.webp?v=1778213068","url":"https:\/\/batteryweb.com\/products\/sigma-dp1q-replacement-battery-74v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}