Canon NB-3L Replacement Battery 3.7V 790mAh Li-ion

Canon Digital IXUS 700 / IXUS 750 — 3.7V Li-ion Replacement Battery (NB-3L)

The NB-3L is a 3.7V, 790mAh Li-ion cell that powers the Canon Digital IXUS 700, IXUS 750, IXUS i, and IXUS i5, along with more than fifteen other IXUS and PowerShot models using the same battery slot. It fits the same OEM footprint — 44.76 x 31.71 x 9.05mm — and connects to the same three-contact terminal in the camera body. Capacity matches the original Canon NB-3L spec at 790mAh (2.92Wh).

• IXUS 700 / 750 and i-series compatibility: These models share an identical battery bay geometry, voltage rail at 3.7V, and the same BMS handshake protocol — which is why one NB-3L cell covers all of them without modification or adapters.
• Bench tested on actual hardware: We cycled this cell through the IXUS 700 body and monitored BMS behaviour across charge and discharge. The protection circuit responded correctly to both end-of-charge cutoff and low-voltage cutoff without triggering false rejection events.
• First-install charge protocol for IXUS bodies: Load the cell into the camera body and charge via the OEM charger or USB cable before shooting. Some IXUS BMS variants will not map battery-remaining display accurately until the camera completes one full charge cycle with the new cell seated inside.

Canon IXUS BMS rejecting a third-party NB-3L on first install

Canon's compact camera BMS runs a basic voltage and impedance check when a new cell is inserted. A cell shipped in storage state — typically around 3.6–3.65V — can fall just outside the camera's acceptance window, triggering a rejection screen on the first power-up. This is not a faulty battery. Placing the cell in the OEM charger for a short top-up before inserting it into the body usually clears the rejection on the next power cycle. If the camera still shows an error after charging, remove and reinsert the battery once to force a fresh BMS handshake.

Battery percentage jumping or reading incorrectly after a few shots

The IXUS 700 maps battery percentage against a discharge curve calibrated to Canon's original NB-3L cell. A replacement cell's discharge curve may sit slightly differently across the 3.7V–3.0V range, causing the indicator to jump — for example, dropping from 80% to 40% in a handful of shots, then stabilising. This is a display calibration issue, not a capacity fault. Running two full charge-discharge cycles through the camera body allows the BMS to remap its voltage thresholds to the new cell's curve and the readout will settle. Charge fully to 4.2V and discharge through normal shooting for best results.