Rich HD-TD910 Compatible Battery 3.7V 720mAh Li-ion

Rich HD-TD910 / ZUP-120 Series — 3.7V Li-ion Replacement Battery

This is a 3.7V, 720mAh Li-ion replacement cell for the Rich HD-TD910, T-1200, and ZUP-120 compact digital cameras. It slots into the same battery compartment as the original cell and connects via the same three-contact interface. Capacity is 720mAh (2.66Wh), matching the original specification.

• HD-TD910 / T-1200 / ZUP-120 platform fit: These models share a common battery bay geometry and the same 3.7V single-cell Li-ion voltage rail. The BMS in each body reads cell voltage and temperature from the same contact arrangement, so one cell works across the group.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a compatible body. The BMS accepted the cell without error flags, and charge termination triggered cleanly at 4.2V as expected for a standard Li-ion cell.
• First-cycle initialisation on these bodies: Charge this cell fully inside the camera body using the OEM charger before your first shoot. Some compact camera BMS systems need one in-body charge cycle to calibrate the battery-remaining display to the new cell's discharge curve — skipping this can cause the indicator to read erratically from the start.

Dead battery indicator on the HD-TD910 with a partially charged replacement cell

Compact camera BMS systems map the battery indicator to a fixed voltage-threshold table programmed for the original cell's discharge curve. A new third-party cell may have a slightly different discharge profile, particularly in the mid-range. The camera reads the voltage, compares it to the table, and can display a low or dead indicator even when the cell still holds usable charge. Running one full in-body charge cycle recalibrates this mapping. After that cycle, the indicator tracks reliably through a normal discharge.

Battery percentage jumping erratically during shooting

This happens when the camera's fuel gauge hasn't synced to the new cell's discharge curve. The BMS samples voltage at intervals — if the curve doesn't match expectations, the percentage reading skips between values rather than stepping down steadily. Flash firing and continuous autofocus create sharp current spikes that temporarily drop cell voltage, which the BMS can misread as a steeper capacity drop. Complete one full discharge-to-cutoff and recharge cycle inside the camera body. After that, the indicator stabilises and the reading reflects actual remaining charge within a normal margin.