Pentax D-LI88 Compatible Battery 3.7V 740mAh Li-ion

Pentax Optio P70 / P80 / WS80 / H90 — 3.7V Li-ion Replacement Battery (D-LI88)

The D-LI88 is a 3.7V, 740mAh lithium-ion cell that powers the Pentax Optio P70, P80, WS80, and H90 compact cameras. It slots directly into the battery compartment and connects to the same BMS contacts as the original Pentax cell. Capacity matches OEM spec at 2.74Wh.

• Optio P70 / P80 / WS80 / H90 compatibility: All four models share the D-LI88 footprint, contact layout, and 3.7V supply rail. The camera's power management circuit draws from the same single-cell configuration across the entire range, so one cell fits all without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Optio platform and confirmed the BMS handshake completed without rejection flags. Voltage under load held within the expected window for the full discharge curve.
• First-cycle initialisation on camera body: Insert this cell and run one full charge cycle through the camera body or OEM charger before heavy shooting. Some Pentax Optio bodies need that initial in-body charge cycle to calibrate the battery-remaining indicator against the new cell's discharge curve.

Flash recycling slowing down as the D-LI88 cell discharges

The Optio P70's flash capacitor pulls a sharp current spike every time it recharges between shots. Early in the charge cycle, the cell delivers that current without issue. As state of charge drops toward the lower voltage threshold, the capacitor recharge current causes a measurable sag, and the camera takes longer to signal flash-ready. This is a normal cell behaviour, not a fault — it reflects the discharge curve of a 740mAh single-cell pack under reactive load.

Battery percentage jumping erratically on the Optio display

The Optio battery indicator maps voltage thresholds to percentage steps. A new D-LI88 cell has a slightly different discharge curve than an aged original cell, so the camera's lookup table can misread the state of charge and show jumpy or non-linear percentages. This is not a defective cell — it is a calibration mismatch. Run two full charge and discharge cycles through the camera body and the indicator will track the new cell's curve more accurately by the third cycle, typically stabilising above 3.6V mid-discharge.