Hitachi HDC831E Replacement Battery 3.7V 1250mAh Li-ion

Hitachi HDC831E — 3.7V Li-ion Replacement Battery (02491-0028-01)

This 3.7V, 1250mAh Li-ion cell is a direct replacement for the Hitachi HDC831E camcorder. It slots into the same battery bay as the original and uses the same OEM part number 02491-0028-01. Voltage and capacity match the factory spec — no modifications needed.

• HDC831E compatibility: The HDC831E uses a compact single-cell 3.7V Li-ion pack with a low-profile 41.95 × 36.05 × 9.80mm footprint. This cell matches those dimensions exactly. The BMS inside the camera reads voltage and temperature from the pack — both rails behave identically to the original on cold boot.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The BMS handshake completed without fault codes. Discharge curve stayed consistent from full charge down to the camera's low-voltage cutoff, with no unexpected shutdowns mid-cycle.
• First-install charge cycle: On first use, run one full charge cycle through the OEM charger or camera body before heavy shooting. Some camera BMS systems only calibrate battery-remaining display after completing that initial in-camera charge — skipping it can cause the indicator to read inaccurately from the start.

Why the HDC831E battery indicator drops suddenly near 30%

The HDC831E maps its battery-remaining display to voltage thresholds tuned for the original cell's discharge curve. A new third-party cell can have a slightly different mid-range discharge slope — the camera sees a voltage drop it wasn't expecting and interprets it as a steeper depletion than actually occurred. The indicator jumps down while usable charge remains in the cell. After one or two full charge-discharge cycles through the camera body, the BMS adjusts and the display stabilises.

HDC831E showing no battery detected on a charged replacement cell

This usually means the camera's authentication check didn't complete on first insert — not a fault with the cell itself. Remove the battery, reinsert it firmly, and power on again. If the error persists, place the cell in the OEM charger until the charge light confirms acceptance, then reinstall. Once the charger has initialised the cell, the camera recognises it at 3.7V nominal and clears the error.