{"product_id":"gopro-hero-8-black-replacement-battery-385v-1220mah-li-ion","title":"GoPro Hero 8 Black Replacement Battery SPJB1B 3.85V 1220mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGoPro Hero 8 Black \/ Hero 7 Black \/ Hero 5 Black — 3.85V Li-ion Replacement Battery (SPJB1B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 1220mAh (4.7Wh) Li-ion cell replaces the GoPro SPJB1B battery across the Hero 5, 6, 7, and 8 Black action camera lineup. It fits the same physical bay and uses the same three-contact interface as the OEM cell. Swap it in when your original cell no longer holds a charge through a full shooting session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHero 5–8 Black shared battery platform:\u003c\/strong\u003e\n    GoPro standardised the SPJB1B footprint across four Hero Black generations — same 35.74 × 31.33 × 11.00mm dimensions, same contact layout, same BMS communication protocol. One cell fits all four bodies without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell in a Hero 8 Black body and confirmed the BMS handshake completed on first insertion, the battery-remaining indicator populated correctly, and the protection circuit tripped cleanly at the low-voltage cutoff threshold during a full drain cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use charge cycle on Hero 8 Black:\u003c\/strong\u003e\n    Charge this cell once through the camera body or OEM charger before heavy shooting. The Hero 8 Black's BMS maps percentage readout against the cell's discharge curve during that first charge — skipping it can cause the indicator to read erratically in early cycles.\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 Hero 8 Black display\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Hero 8 Black uses voltage-threshold mapping to estimate remaining charge. A new cell has a slightly different discharge curve than a worn OEM cell, so the camera's fuel gauge can misread it for the first few cycles. The indicator may jump from 80% to 50% without warning, then stabilise. Run two or three full charge-and-drain cycles and the readout settles — the BMS recalibrates its thresholds against the actual curve of the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHero 8 Black showing dead-battery icon on a replacement cell that still has charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the camera body cuts power at a voltage it reads as depleted, but the replacement cell's resting voltage sits slightly above the OEM cutoff point. The BMS is not rejecting the cell — it is misreading the state-of-charge on first use. Place the battery in the OEM charger or a compatible external charger and bring it to a full 4.2V before inserting it into the camera. That single full-charge pass clears the false-dead reading in most cases.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333620760666,"sku":"BWCS-GDB800MX-1","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333620793434,"sku":"BWCS-GDB800MX-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333620826202,"sku":"BWCS-GDB800MX-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GDB800MX-1.webp?v=1778212976","url":"https:\/\/batteryweb.com\/products\/gopro-hero-8-black-replacement-battery-385v-1220mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}