Pentax D-LI68 Replacement Battery 3.7V 800mAh Li-ion

Pentax Optio S12 / S10 / A36 — 3.7V Li-ion Replacement Battery (D-LI68)

This is a 3.7V, 800mAh Li-ion cell built to the D-LI68 specification. It fits the Pentax Optio S12, Optio S10, and Optio A36 compact digital cameras. Voltage, connector, and physical dimensions match the original — 40.26 × 35.24 × 6.50mm.

• Optio S10, S12, and A36 compatibility: All three models share the same battery bay dimensions, 3.7V rail, and D-LI68 connector pinout. The BMS in each body reads cell voltage and temperature from the same contact points, so one battery spec covers all three.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Optio S12 body. The BMS accepted the cell without rejection flags, and the protection circuit tripped correctly at low-voltage cutoff — no thermal anomalies recorded.
• First-cycle initialisation on the Optio S12: Charge this battery fully inside the camera body or OEM charger before your first shoot. The Optio S12 BMS maps its battery-remaining display to the discharge curve only after completing one full charge cycle — skipping this step causes erratic percentage readings early on.

Flash recycling slowing down mid-shoot on the Optio S12

The Optio S12's built-in flash pulls a short, sharp current spike to recharge its capacitor between shots. As cell voltage drops toward the lower end of its discharge curve, that capacitor recharge takes longer — you'll notice the flash-ready indicator lagging. This is normal behaviour tied to available current, not a faulty battery. If recycling time increases noticeably, it's a reliable indicator the cell is below roughly 3.5V and nearing end of charge.

Battery percentage jumping erratically on the Optio S10 or S12 display

The Optio S10 and S12 map their indicator segments to fixed voltage thresholds calibrated against the original OEM discharge curve. A new replacement cell can have a slightly different mid-range voltage profile, which causes the indicator to jump — dropping two bars quickly, then holding for a long stretch. This is a display mapping issue, not a capacity fault. Run one full charge-to-discharge cycle in the camera body and the indicator will stabilise as the BMS relearns the cell's curve. Check that the battery reads above 3.6V at rest before dismissing a low reading.