{"product_id":"sigma-sd14-replacement-battery-74v-1500mah-li-ion","title":"Sigma BP-21 SD14 Replacement Battery 7.4V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSigma SD14 — 7.4V Li-ion Replacement Battery (BP-21)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1500mAh Li-ion replacement for the Sigma BP-21 battery. It fits the Sigma SD14 DSLR body directly, powering the imaging sensor, onboard processing, and all in-body electronics during shooting. Capacity matches OEM spec at 11.1Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSD14 platform fit:\u003c\/strong\u003e\n    The SD14 uses a single-cell Li-ion pack at 7.4V nominal with a specific contact layout and BMS communication line. This replacement matches that voltage rail and connector geometry so the camera body reads the cell correctly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the SD14's charge and discharge sequence. The BMS handshake completed on first insertion, and the camera's battery indicator tracked discharge without false low-battery warnings during the test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle initialisation on the SD14:\u003c\/strong\u003e\n    Run a full charge through the OEM Sigma charger or direct in-body charging before your first shoot. The SD14's BMS calibrates its remaining-charge display against the new cell's discharge curve during that initial cycle — skipping it can cause the indicator to read inaccurately for the first few sessions.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically on the SD14 display\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SD14 maps its battery indicator to a fixed voltage-threshold table calibrated for the original BP-21 discharge curve. A new replacement cell — even at full charge — discharges along a slightly different voltage slope until the BMS has logged one or two full cycles. During this break-in period, the indicator can jump forward or back by 10–20% between shots. Run two complete charge-to-discharge cycles and the BMS recalibrates its threshold mapping to the new cell. After that, the display tracks normally and stabilises around 3.6–3.7V per cell at the midpoint reading.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSD14 showing dead battery indicator on a cell that still has charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SD14 can throw a low-battery cutoff before the cell is genuinely depleted if the BMS hasn't completed its initialisation cycle with the new battery. This happens because the camera's protection circuit trips at a voltage threshold it expects from a worn OEM cell, not a fresh replacement. Remove the battery, reinsert it, and power on — the camera will often resume operation with charge remaining. To clear the fault properly, charge the replacement fully in-body once, which resets the BMS threshold reference to the new cell's resting voltage of approximately 8.4V at full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333870092378,"sku":"BWCS-NP400-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333870125146,"sku":"BWCS-NP400-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333870157914,"sku":"BWCS-NP400-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NP400-1.webp?v=1778213402","url":"https:\/\/batteryweb.com\/products\/sigma-sd14-replacement-battery-74v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}