D-Li92 Pentax Megazoom X70 Replacement Battery 3.7V 800mAh

Pentax Megazoom X70 / Optio Series — 3.7V Li-ion Replacement Battery (D-Li92)

This is a 3.7V, 800mAh Li-ion cell built to the D-Li92 specification. It fits the Pentax Megazoom X70, Optio I-10, Optio RZ10, Optio WG-1, and over fifteen other Pentax compact camera bodies that share this battery format. Dimensions are 40.12 × 34.00 × 6.72mm — physically identical to the OEM cell.

• Shared battery platform across Optio and Megazoom lines: Pentax standardised the D-Li92 across multiple compact bodies because they share the same 3.7V power rail, contact layout, and BMS communication protocol. Swapping between compatible models carries no risk of connector mismatch or voltage mismatch.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Pentax Optio body. The BMS accepted the cell without flagging an incompatibility error, and protection circuits responded correctly to charge termination and over-discharge thresholds.
• First-cycle initialisation on Pentax bodies: Pentax compact cameras calibrate the battery-remaining indicator during the first charge cycle completed inside the camera body or OEM charger. Insert the new cell, charge it fully via the camera before shooting, and the fuel gauge will read accurately from the first session onward.

Why the Megazoom X70 battery indicator drops sharply during burst shooting or video

The X70 pulls current simultaneously from the imaging sensor, lens drive motor, and LCD backlight during burst or video modes. That combined draw creates a momentary voltage sag that the battery indicator interprets as a lower state of charge than is actually present. The BMS reads terminal voltage, not coulomb count, so sag during high-draw moments causes the displayed percentage to fall faster than the true capacity warrants. Once load drops — camera idle or playback mode — the indicator often recovers a few percent.

Camera displaying dead battery symbol on a replacement cell that just came off charge

This happens when the camera body has not yet completed a full charge cycle with the new cell and its voltage-threshold mapping is still calibrated to the old, degraded cell. The camera sees the new cell's resting voltage as out of expected range and refuses to boot. Charge the replacement cell fully inside the camera body or OEM charger — do not interrupt the cycle. After one complete charge, the BMS resets its reference and the body will read the cell correctly at 3.7V nominal.