Technaxx C4000 Compatible Battery 3.7V 1050mAh Li-ion

Technaxx C4000 — 3.7V Li-ion Replacement Battery

This 3.7V, 1050mAh Li-ion cell replaces the original battery in the Technaxx C4000 compact digital camera. It restores full shooting capability when the original cell no longer holds a charge or fails to power the camera body. Capacity is 3.89Wh — matched to the C4000's power rail requirements.

• C4000 fit: The C4000 runs a standard 3.7V single-cell Li-ion architecture with a low-current draw profile typical of compact cameras. This cell matches that voltage rail and the physical footprint — 53.20 × 35.30 × 7.10mm — so it seats correctly in the battery compartment without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench to verify BMS handshake and stable voltage delivery. The cell held steady across draw spikes from flash capacitor recharging and continuous video capture without triggering premature low-battery cutoff.
• First-install charge cycle: Insert the cell and charge it fully inside the C4000 body before your first shoot. Some compact camera BMS systems recalibrate the battery-remaining indicator only after a full charge cycle completed through the camera body — skipping this step can cause the display to misread remaining capacity from the start.

Flash capacitor recharge dragging the C4000 battery indicator down

Every time the C4000 fires its built-in flash, the capacitor pulls a short, sharp burst of current to recharge. On an ageing original cell, that spike causes a visible voltage sag that the BMS reads as low charge and flags on the display. A fresh 1050mAh cell handles the recharge spike with less sag, so the battery indicator stays stable between shots. If the indicator still drops immediately after each flash on a new cell, confirm the first-install charge cycle was completed inside the camera body.

Battery percentage jumping or resetting mid-shoot

The C4000's fuel gauge maps voltage thresholds to percentage steps calibrated to the original cell's discharge curve. A new cell discharges slightly differently, especially in the mid-range, which can make the percentage reading jump forward or reset unexpectedly. This is a display calibration issue, not a cell fault. Run two full charge-discharge cycles through the camera body and the indicator will settle into a more accurate read of remaining capacity.