{"product_id":"nikon-np55-replacement-battery-6v-2100mah-ni-mh","title":"NiKon NP55 Replacement Battery 6V 2100mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNiKon NP55 \/ NP66 \/ NP77 Series — 6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V 2100mAh Ni-MH replacement battery for NiKon Coolpix compact cameras that use the NP-55, NP-66, NP-66H, or NP-77 battery format. It fits the original battery bay without modification. Capacity is drawn from product data at 2100mAh (12.6Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNP-55 \/ NP-66 \/ NP-77 compatibility:\u003c\/strong\u003e\n    These three battery designations share the same 6V voltage rail and physical form factor across the NiKon Coolpix compact range. The BMS handshake in these cameras checks voltage and connector pin count — not a proprietary authentication chip — so a correctly specced replacement cell clears that check without issue.\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, monitoring BMS response at both charge acceptance and low-voltage cutoff. The cell hit rated capacity within two full cycles and the BMS registered a clean cutoff at the expected low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use charge cycle:\u003c\/strong\u003e\n    Charge this battery fully inside the camera body or OEM charger before your first shoot. Some NiKon Coolpix BMS implementations require one complete in-body charge cycle to calibrate the battery-remaining display to the new cell's discharge curve.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCamera showing dead battery indicator on a partially charged replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNiKon Coolpix cameras map battery level to voltage thresholds tuned to an aged OEM cell's discharge curve. A new Ni-MH cell has a flatter discharge curve than a degraded original, so the camera reads mid-charge voltage as critically low. This is a calibration mismatch, not a cell fault. One full charge-discharge cycle inside the camera body resets the BMS voltage map and clears the false dead-battery warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically between shots\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eErratic percentage readings happen when the camera's indicator algorithm is sampling voltage during flash capacitor recharge — a high-current event that briefly sags cell voltage. The camera misreads that sag as a drop in state of charge and updates the display accordingly. This is most visible on cameras with built-in flash set to auto-fire. Switch flash to manual or forced-off during a calibration cycle, then let the display stabilise at a resting voltage of approximately 6V before shooting normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333893685338,"sku":"BWCS-NP55-1","price":35.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43333893718106,"sku":"BWCS-NP55-2","price":41.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43333893750874,"sku":"BWCS-NP55-3","price":45.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NP55-1.webp?v=1778213590","url":"https:\/\/batteryweb.com\/products\/nikon-np55-replacement-battery-6v-2100mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}