{"product_id":"nikon-coolpix-8400-replacement-battery-74v-1100mah-li-ion","title":"NiKon EN-EL7 Coolpix 8400 Replacement Battery 7.4V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNiKon Coolpix 8400 \/ 8800 — 7.4V Li-ion Replacement Battery (EN-EL7)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1100mAh Li-ion replacement for the NiKon EN-EL7 battery. It fits the Coolpix 8400 and Coolpix 8800 compact digital cameras. Capacity matches the OEM spec at 8.14Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCoolpix 8400 and 8800 compatibility:\u003c\/strong\u003e\n    Both cameras share the same battery bay geometry, voltage rail, and BMS communication protocol. The EN-EL7 form factor and contact layout are identical across both models, so one cell works in either body 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 charge and discharge on a Coolpix body. The BMS accepted the cell, reported charge state without error flags, and held voltage above 6.8V through the bulk of the discharge curve before the low-battery indicator triggered.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle initialisation on Coolpix bodies:\u003c\/strong\u003e\n    Charge this cell inside the camera body or OEM charger before your first shoot. The Coolpix BMS maps its battery-remaining display against a charge curve it builds on the first full cycle — skipping this step causes the indicator to read erratically until that cycle is completed.\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 on the Coolpix 8400 display after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Coolpix 8400 uses voltage thresholds to estimate remaining charge and maps those thresholds against a discharge curve it learned from the original cell. A new cell has a slightly different discharge curve, so the camera's indicator can jump — showing 80%, then 40%, then 80% again within a short period. This is not a fault in the replacement cell. Run one complete charge-to-discharge cycle through the camera body and the indicator stabilises as the BMS recalibrates its threshold map to the new cell's curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCoolpix 8800 flash not fully recycling between shots on a new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe built-in flash on the Coolpix 8800 draws a sharp recharge current from the battery to refill its capacitor between shots. If the cell voltage sags during that recharge burst — common when a new cell hasn't completed its first full cycle — the flash recycle time stretches and the ready indicator lags behind actual charge state. Check open-circuit voltage on the cell before use: it should read at least 8.2V fresh off the charger. If it reads below 7.8V after a full charge, the cell may not have completed its initialisation cycle — charge it again fully before shooting.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333876285530,"sku":"BWCS-ENEL7-1","price":36.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43333876318298,"sku":"BWCS-ENEL7-2","price":42.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43333876351066,"sku":"BWCS-ENEL7-3","price":46.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ENEL7-big.webp?v=1778213541","url":"https:\/\/batteryweb.com\/products\/nikon-coolpix-8400-replacement-battery-74v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}