Praktica DMMC-10 Compatible Battery 3.7V 750mAh Li-ion

Praktica DMMC-10 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 750mAh Li-ion replacement battery for the Praktica DMMC-10 compact digital camera. It slots into the same battery compartment as the original and restores full camera operation — power-on, image capture, processing, and storage. Capacity is 750mAh (2.78Wh), matching the original specification.

• DMMC-10 and DMMC10 fit: Both model number variants refer to the same camera body with the same battery bay dimensions (46.20 × 34.14 × 5.68mm) and the same 3.7V power rail — one battery covers both.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the bench. The protection circuit responded correctly to cutoff at both ends — no runaway charge, clean low-voltage shutoff.
• First-cycle recalibration on the DMMC-10: After fitting this battery, run one complete discharge down to camera auto-shutoff, then charge fully before shooting. The DMMC-10's fuel gauge reads against a discharge curve — a fresh cell has a different curve than a worn original, and skipping this step causes the charge indicator to read inaccurately from the start.

Why the DMMC-10 shows a full charge icon but shuts off early

The DMMC-10's fuel gauge IC was calibrated against the original cell's discharge curve. A new cell — even one with identical rated capacity — has a slightly different voltage-versus-charge profile. The camera reads voltage and maps it to percentage using the old curve, so the two fall out of sync. This makes the camera display full or near-full bars right up until the cell voltage drops below the operating threshold and the camera cuts out. One full discharge-to-shutoff followed by a full charge resets the reference points the fuel gauge uses.

Battery percentage jumping erratically on the DMMC-10 after replacement

Erratic percentage readings after a cell swap are a fuel gauge recalibration issue, not a faulty battery. The coulomb counter inside the camera accumulated error data from the old cell and hasn't yet mapped its reference against the new one. The fix is straightforward: discharge fully until the camera shuts itself off, then charge uninterrupted to 100%. After one complete cycle the readings stabilise. Check that the battery contact pins in the compartment are clean and making firm contact — a loose connection produces the same symptom and won't resolve with cycling.