About this replacement
Canon E61 / ES900 Series — 6V Ni-MH Replacement Battery (BP-722)
The BP-722 is a 6V, 4200mAh (25.2Wh) Ni-MH battery pack for Canon camcorders including the E61, ES900, ES180, UC2Hi, and over 120 additional compatible models. It slots into the same battery bay and uses the same contact layout as the original Canon pack. Capacity figure is sourced from product data — 4200mAh.
- E61 and ES-series platform compatibility: These camcorder lines share the BP-722 form factor, contact pinout, and 6V supply rail across the range. The BMS in each body communicates charge state through the same three-contact interface, so one cell SKU covers the full group without firmware or connector differences.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Canon ES-series body. The BMS accepted the pack on first install, charge termination triggered correctly at full capacity, and discharge cutoff engaged at the expected low-voltage threshold without early shutdown.
- First-install charge cycle on camcorder bodies: Canon ES and E-series bodies map the battery-remaining display to a learned discharge curve. Before your first shoot, run one full charge cycle directly through the camcorder body or the OEM charger — this lets the BMS calibrate the indicator to the new cell's actual discharge profile.
Canon ES-series BMS rejecting a new BP-722 cell on first install
Canon camcorder bodies in the ES and E series run a contact handshake when a new pack is seated. If the cell has been stored at low voltage — which is common with new stock — the BMS may read the pack as faulty and display an error or refuse to power on. The fix is straightforward: seat the battery, connect the OEM charger or the in-camera charging circuit, and allow a full charge before attempting to power on. Once the pack reaches threshold voltage, the body accepts it and normal operation resumes.
Battery percentage jumping erratically on the Canon E61 display
Ni-MH cells have a flatter discharge curve than Li-ion, and Canon's indicator firmware maps voltage thresholds to percentage steps calibrated to the original cell's curve. A replacement cell — even a fresh one — can cause the display to skip steps or jump from 80% to 20% without warning. This is not a cell fault. Run two full charge-discharge cycles through the camera body, and the BMS re-maps its threshold table to the new cell. After the second cycle, the percentage reading stabilises across the discharge range.