Hook-Eye T01 Replacement Battery 3.7V 2000mAh K102095

Hook-Eye T01 Underwater Fishing Camera — 3.7V Li-ion Replacement Battery (K102095)

This is a 3.7V, 2000mAh Li-ion replacement cell for the Hook-Eye T01 underwater fishing camera. It slots directly into the T01 body and powers the camera's imaging, recording, and transmission functions. Capacity is sourced from the product specification — 2000mAh / 7.4Wh.

• T01 platform fit: The T01 and its underwater fishing camera variants share the same battery bay, connector pinout, and BMS handshake requirements. One cell covers the full model range listed under the T01 line.
• Bench tested on actual hardware: We cycled this cell through the T01's BMS at full charge and discharge. The protection circuit responded correctly to over-discharge cutoff and accepted recharge without fault flags.
• First-install charge cycle on the T01: Run one complete charge cycle through the T01 body or OEM charger before your first session. The T01's BMS calibrates its battery-remaining display against the cell's discharge curve during this cycle — skipping it often causes the indicator to read inaccurately from the start.

Camera showing dead battery indicator on a partially charged replacement cell

The T01 maps its battery indicator against a discharge curve stored in the BMS. A fresh replacement cell that hasn't completed a full charge cycle can sit at a voltage the BMS interprets as critically low, even when the cell holds usable charge. This is a calibration mismatch, not a faulty battery. Charge the cell fully in the T01 body until the indicator confirms 100%, then discharge normally — the indicator will track correctly after that cycle.

Battery percentage jumping erratically on the T01 display mid-session

Erratic percentage readings happen when the T01's voltage-threshold mapping doesn't align with the discharge curve of a new cell. The camera samples terminal voltage and converts it to a percentage using fixed reference points. A replacement cell with a slightly flatter discharge curve can cause the displayed value to jump — dropping several percent in seconds, then stabilising. Complete two full charge-discharge cycles through the camera body. After the second cycle, the BMS recalibrates its reference points and the display stabilises above 3.5V under load.