Pentax D-LI2 Optio 330 Replacement Battery 3.7V 1050mAh

Pentax Optio 330 / 430 Series — 3.7V Li-ion Replacement Battery (D-LI2)

This is a 3.7V 1050mAh Li-ion cell built to the D-LI2 spec for the Pentax Optio 330, 330RS, 430, and 430RS compact digital cameras. It powers the image sensor, LCD, and processing functions during shooting. Voltage and physical dimensions match the OEM cell exactly — 53.20 × 35.30 × 7.10mm.

• Optio 330 and 430 platform fit: The 330 and 430 series share the same battery bay geometry and 3.7V supply rail, which is why one D-LI2 cell covers both. The BMS in each body reads cell voltage across the same threshold points, so no hardware modification is needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on camera hardware and confirmed the BMS accepts the cell without lockout. The protection circuit trips correctly at low-voltage cutoff without forcing a hard camera fault.
• First-install charge cycle on the Optio body: Run the first full charge through the camera body or OEM charger before shooting. Some Optio bodies need one in-camera charge cycle to calibrate the battery-remaining indicator to the new cell's discharge curve — skipping this step causes erratic percentage readings.

Why the Optio 330 shows a dead battery indicator on a partially charged replacement cell

The Optio 330 maps its battery indicator to fixed voltage thresholds tied to the original cell's discharge curve. A new Li-ion cell holds a slightly flatter mid-range voltage profile until it is broken in, which can push it outside the camera's expected voltage window at certain charge states. The body reads that voltage offset as a near-empty cell even when the cell has capacity remaining. One full charge-discharge cycle in the camera body recalibrates the display to match the new cell — after that, readings stabilise.

Flash not fully recycling between shots on the Optio 430RS

The flash capacitor on the Optio 430RS draws a sharp current spike to recharge between frames. If the cell voltage sags during that spike — common at the end of a discharge cycle — the capacitor does not reach full charge before the next shot is taken. The result is noticeably dimmer flash output and longer recycle gaps. Check cell voltage with a multimeter: if resting voltage is below 3.6V between shots, the cell is at low state of charge and needs recharging before continuing flash-heavy shooting.