GoPro Hero 3 Replacement Battery AHDBT-201 3.7V 950mAh

GoPro Hero 3 — 3.7V Li-ion Replacement Battery (AHDBT-201)

This is a 3.7V, 950mAh lithium-ion battery that replaces the original cell in the GoPro Hero 3, Hero3 White Edition, Hero3 Silver Edition, and related HD Hero3 variants. It fits any model that uses the AHDBT-201 or AHDBT-301 OEM part numbers. Dimensions are 36.77 × 28.80 × 13.21mm — a direct physical match to the factory cell.

• Hero 3 platform compatibility: The Hero 3 line — White, Silver, and Black editions — all share the same battery bay dimensions and voltage rail. Each model draws from the same 3.7V cell architecture, so one replacement covers the full lineup without modification.
• Bench tested on actual hardware: We ran this cell on a Hero3 Silver and monitored the BMS handshake on first install. The protection circuit responded correctly to charge input and discharge cutoff, and the camera accepted the cell without error on initial boot.
• First charge cycle on Hero 3: Charge the new cell fully inside the camera body using the OEM USB cable before your first shoot. The Hero 3's battery indicator maps voltage thresholds at first charge — skipping this step can cause the remaining battery display to read inaccurately throughout the cell's life.

Why the Hero 3 shows a dead battery icon on a freshly charged replacement cell

The Hero 3 firmware reads battery state by mapping voltage to a fixed discharge curve calibrated during the first charge cycle. A new cell that hasn't been charged inside the camera body yet presents a voltage profile the firmware hasn't indexed, so it defaults to a low or empty indicator even at full charge. This isn't a cell fault — it's a calibration gap. Perform one complete charge-to-full cycle via the camera body, and the indicator resets to accurate readings. After that cycle, the camera tracks voltage correctly across the full discharge range.

Battery percentage jumping erratically mid-recording on the Hero 3

During continuous HD video recording, the Hero 3 draws additional current for the image processor and wireless module simultaneously, causing rapid voltage dips that the firmware misreads as large capacity drops. A replacement cell with a slightly different internal resistance than the aged OEM cell amplifies this effect until the BMS recalibrates. The fix is one full discharge-to-shutdown cycle followed by a full charge — this forces the indicator algorithm to re-anchor its percentage steps to the new cell's actual discharge curve. After recalibration, readings stabilise above 3.5V under normal recording load.