Pentax D-LI72 Optio Z10 Replacement Battery 3.7V 700mAh

Pentax Optio Z10 — 3.7V Li-ion Replacement Battery (D-LI72)

This is a 3.7V, 700mAh lithium-ion replacement for the D-LI72 battery used in the Pentax Optio Z10 compact digital camera. It fits the Optio Z10 body directly and powers the camera for photo and video capture. Voltage and cell dimensions match the original specification: 47.50 × 15.40 × 15.00mm.

• Optio Z10 fitment: The Z10 uses the D-LI72 cell on a 3.7V rail with a single-cell BMS. The connector and contact plate position are fixed to this form factor — there is no multi-voltage variant for this camera body.
• Bench tested on actual hardware: We cycled this cell through the Optio Z10 body and confirmed the BMS handshake, charge acceptance, and discharge cut-off voltage. The camera's battery indicator tracked consistently across the discharge curve.
• First charge on the Z10: Charge this cell fully inside the camera body or OEM charger before shooting. The Optio Z10's battery-remaining display calibrates its threshold mapping on the first full charge cycle — skipping this step can cause the indicator to read inaccurately from the first use.

Why the Optio Z10 shows a dead-battery icon on a partially charged replacement cell

The Z10 maps its battery indicator to a set of voltage thresholds calibrated against the original D-LI72 discharge curve. A new replacement cell may sit at a resting voltage that falls outside the camera's expected range before the first full cycle completes. This causes the body to display a low or empty battery icon even when the cell holds a usable charge. One full charge cycle inside the camera body resets this mapping and restores accurate indicator behaviour.

Battery percentage jumping erratically on the Optio Z10 display

Erratic percentage readings on the Z10 occur when the camera's voltage-to-capacity lookup table does not yet match the new cell's discharge curve. The indicator may jump from 80% to 20% in a single shot sequence, or recover mid-session without charging. This is a calibration issue, not a cell fault. Run the replacement cell through two complete charge-discharge cycles via the camera body to allow the BMS to recalibrate — after the second cycle, the reading typically stabilises within a consistent range.