About this replacement
AKASO Seemor 200 — 3.7V Li-Polymer Replacement Battery (Seemor-200)
This 3.7V, 3600mAh Li-Polymer cell is a direct replacement for the AKASO Seemor 200 action camera. It fits the Seemor 200 and Seemor-200 variants and carries 13.32Wh of usable energy. Swap it in when the original cell no longer holds a charge through a full shoot.
- Seemor 200 fit: The Seemor 200 and Seemor-200 share the same battery bay dimensions and the same 3.7V nominal voltage rail. This cell matches that physical format — 71.80 × 43.20 × 8.00mm — and the BMS voltage thresholds the camera expects at startup.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS in the Seemor 200 body accepts the cell without error flags and that charge termination triggers correctly at full capacity.
- First-cycle initialisation on the Seemor 200: Run the first full charge inside the camera body itself, not a third-party USB charger. The Seemor 200's onboard BMS maps the battery-remaining indicator against the cell's discharge curve during that first cycle — skipping it can cause the indicator to read inaccurately for the first several uses.
Why the Seemor 200 shows a dead battery icon on a partially charged replacement cell
The Seemor 200 calibrates its battery indicator by reading the cell voltage at specific discharge thresholds. A new Li-Polymer cell fresh out of packaging typically sits between 3.6V and 3.75V — inside the camera's "low battery" voltage window if the threshold mapping hasn't been initialised. The camera interprets this as a near-dead cell rather than a partially charged one. One full charge cycle inside the camera body resets this mapping and the indicator reads correctly from that point forward.
Battery percentage jumping erratically during recording on the Seemor 200
This happens when the camera's voltage-to-percentage table doesn't match the discharge curve of the new cell. During video recording, current draw spikes briefly whenever the processor or sensor increases output, pulling the cell voltage down momentarily. The camera reads that dip as a steep capacity drop and jumps the percentage indicator down. After one or two full charge-discharge cycles, the BMS recalibrates against the actual curve and the display stabilises — charge fully to 4.2V, then run the cell down to auto-shutoff before recharging.