Sanyo DB-L40 Xacti DMX-HD800 Replacement Battery 3.7V 900mAh

Sanyo Xacti DMX-HD800 Series — 3.7V Li-ion Replacement Battery (DB-L40)

This is a 3.7V, 900mAh Li-ion cell built to the DB-L40 specification. It fits the Sanyo Xacti DMX-HD800, DMX-HD2, DMX-HD1A, and VPC-HD1 compact HD camcorders, plus seven additional Xacti models. Capacity matches the OEM rating exactly — 900mAh / 3.33Wh.

• Xacti HD series compatibility: These camcorders share the same DB-L40 cell footprint, 3.7V nominal rail, and battery connector pinout across the lineup. One cell covers the full range without any wiring or adapter changes.
• Bench tested on actual hardware: We ran this cell through the Xacti BMS charge cycle and confirmed the protection circuit trips correctly at both high-voltage cutoff and low-voltage discharge floor. No unexpected shutdowns occurred during sustained HD video recording.
• First-use charge cycle on Xacti bodies: Insert the new cell and charge fully inside the camcorder body before shooting. The Xacti battery-remaining indicator maps to a learned discharge curve — one full in-camera charge cycle lets the BMS calibrate the gauge accurately for this cell.

Battery percentage jumping on the Xacti HD800 display

The DMX-HD800 maps its battery indicator to voltage thresholds set during the first charge cycle. A new cell has a slightly different resting voltage curve than a worn OEM cell, so the indicator can skip between levels until the BMS recalibrates. Run one complete charge-to-full then record until the body shuts down automatically. After that single cycle, the display tracks the actual state of charge accurately against the new cell's discharge profile.

Xacti body warm during sustained HD recording on a new cell

The DMX-HD800 pulls current simultaneously from the image sensor, video processor, and optical image stabilisation system during HD recording. This combined draw is higher than still-capture mode and generates heat at both the cell and the body chassis. If the body feels warm after extended clips, pause recording for 60–90 seconds to let the processor thermal load drop. Check that the cell voltage hasn't sagged below 3.4V under load — sustained sag below that threshold signals a cell that needs replacement.