About this replacement
GoPro Hero 7 Silver / Hero 7 White — 3.85V Li-ion Replacement Battery (SPTM1B)
This is a 3.85V, 1100mAh Li-ion replacement battery for the GoPro Hero 7 Silver and Hero 7 White action cameras. It matches the OEM part number SPTM1B and fits the compact battery bay on both models. Voltage and physical dimensions are identical to the factory cell: 33.90 × 31.10 × 10.90mm.
- Hero 7 Silver and White compatibility: Both cameras share the same battery format, connector pinout, and BMS handshake protocol — the same cell works in either body without modification.
- Bench tested on actual hardware: We ran this cell through the Hero 7 Silver body. The BMS accepted the cell on first install, charge termination triggered correctly at 4.2V, and discharge protection cut in at the expected low-voltage threshold under 4K recording load.
- First-cycle initialisation on the Hero 7: Run the first full charge cycle through the camera body using GoPro's USB-C port, not an external third-party charger. The Hero 7 BMS maps battery-remaining percentages to its own internal discharge curve during that initial cycle — skipping this step can cause erratic percentage readings from the first session.
Why the Hero 7 Silver shows a dead battery icon on a charged replacement cell
The Hero 7 Silver reads cell state through a voltage-threshold lookup, not a fuel gauge IC. A fresh replacement cell sitting at storage voltage — typically around 3.6–3.7V — can fall below the camera's "minimum acceptable" threshold before the first charge. When that happens, the body displays a dead or missing battery icon even though the cell itself is fine. Inserting the battery and connecting USB-C power for 5–10 minutes is enough to bring the cell voltage above the threshold and allow the camera to boot normally.
Battery percentage jumping erratically after fitting a new cell
This is a calibration issue, not a faulty battery. The Hero 7's battery indicator is tuned to the discharge curve of the original GoPro cell. A replacement cell with a slightly different discharge profile causes the voltage-to-percentage mapping to misread at mid-charge states — producing jumps from 60% to 20% with no actual load change. Running two full charge and discharge cycles through the camera body recalibrates the mapping. After those cycles, the indicator should track consistently from 4.2V down to the cutoff threshold.