{"product_id":"casio-exilim-ex-s770sr-replacement-battery-37v-650mah-li-ion","title":"Casio NP-20 Exilim EX-S770SR Replacement Battery 3.7V 650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCasio Exilim EX-S770SR Series — 3.7V Li-ion Replacement Battery (NP-20)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 650mAh Li-ion cell built to the NP-20 spec. It fits the Casio Exilim EX-S770SR and over 60 other Exilim compact camera bodies that use the same NP-20 footprint. The cell measures 50.80 × 32.45 × 4.60mm — same physical envelope as the original.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eExilim EX-S770 and EX-S880 platform:\u003c\/strong\u003e\n    Both series share the NP-20 battery slot, the same 3.7V power rail, and the same contact pinout. One cell covers the full range without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on an EX-S770 body. The camera's BMS accepted the cell, reported a charge state, and held the LCD on through a full discharge without dropping into low-voltage cutoff prematurely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on Exilim bodies:\u003c\/strong\u003e\n    Run one complete charge cycle through the camera body or OEM charger before shooting. Exilim cameras map their battery-remaining indicator against a stored voltage curve — skipping this step causes the indicator to read erratically from the first shot.\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 showing on a partially charged NP-20 replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eExilim compact cameras use a simple voltage-threshold system to estimate remaining charge. A new third-party cell has a slightly different discharge curve than the original, so the camera can read 3.85V on the cell and still flash the empty battery icon. This is a calibration mismatch, not a faulty cell. Charge the replacement fully in-camera once, let it discharge to auto-off, then charge again — the threshold mapping corrects after one full cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFlash not recycling fully between shots on a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EX-S770's flash capacitor draws a sharp recharge current spike after each fired shot. If the cell voltage sags below 3.6V mid-shoot — common when the cell is partially discharged or cold — the capacitor recharge slows and the ready indicator lags. This is not a flash fault. Bring the cell to a full charge before a shooting session and keep the camera body above 15°C. At full charge, the cell sustains the capacitor recharge without measurable sag.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333865832538,"sku":"BWCS-NP20CA-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333865865306,"sku":"BWCS-NP20CA-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333865898074,"sku":"BWCS-NP20CA-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NP20CA-1.webp?v=1778213291","url":"https:\/\/batteryweb.com\/products\/casio-exilim-ex-s770sr-replacement-battery-37v-650mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}