Thomson BP-65H 14.4V Camera Replacement Battery 4400mAh Li-ion

Thomson LDX-120 / LDX-150 Series — 14.4V Li-ion Replacement Battery (BP-65H)

This is a 14.4V, 4400mAh (63.36Wh) Li-ion replacement battery for Thomson broadcast and studio cameras. It fits the LDX-110, LDX-120, LDX-140, and LDX-150 models. OEM part numbers covered are BP-65H, E-80, and E-80S.

• LDX platform battery compatibility: The LDX-110 through LDX-150 series all share the same 14.4V battery rail and connector pinout. That common architecture means one cell type covers the full range. The BMS handshake is consistent across these bodies, so no model-specific firmware difference affects acceptance.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the LDX platform. The BMS accepted the cell cleanly, triggered protection cutoff at the correct low-voltage threshold, and reported charge state without erratic jumps at steady draw.
• First-install charge cycle on LDX bodies: Insert the battery and charge it fully inside the camera body or OEM charger before your first shoot. LDX bodies map remaining charge against a stored discharge curve — skipping this step can cause the indicator to read incorrectly until one full cycle completes.

Battery percentage reading incorrectly on LDX bodies after fitting a replacement cell

Thomson LDX cameras track remaining charge by comparing real-time cell voltage against a learned discharge curve stored in the camera body. A new cell has a slightly different discharge profile than a worn original pack, so the body's estimate can start off-calibration. This shows as the percentage sticking at a fixed number, then dropping sharply, or reading full charge when the cell is partially depleted. Run one full charge cycle — drain the cell under normal camera load, then charge to 100% in the OEM charger — and the body recalibrates its curve to the new cell. After that cycle, the percentage display tracks accurately within normal tolerance.

Thomson LDX showing a dead-battery warning immediately after installing a new cell

This is a BMS authentication check, not a fault with the cell itself. On first insertion, some LDX bodies will flag an unrecognised or depleted state before they have completed a communication handshake with the new pack. The fix is a single power cycle — remove the battery, wait ten seconds, reinsert it, then turn the camera on. If the warning persists, place the battery in the OEM charger until it reads at least 12.5V, then reinsert into the body. That charge level is typically enough for the BMS to complete its handshake and clear the warning.