Magnex DC-5300 Replacement Battery 3.7V 1050mAh

Magnex DC-5300 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1050mAh Li-ion cell built to replace the original battery in the Fujifilm DC-5300 compact camera. It fits directly into the DC-5300 battery compartment and connects to the camera's charging and power management circuit. Capacity figures come from the product data: 1050mAh / 3.89Wh.

• DC-5300 compatibility: The DC-5300 uses a slim single-cell Li-ion pack at 3.7V nominal. This cell matches that voltage rail and the physical form factor — 53.20 x 35.30 x 7.10mm — so the battery compartment door closes correctly and the contacts seat fully.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a DC-5300 body. The BMS accepted the cell after one full charge cycle completed via the camera body, and the battery indicator read consistently across the discharge curve.
• First-cycle initialisation on the DC-5300: Run one complete charge cycle inside the camera body or OEM charger before your first shoot. Some Fujifilm BMS implementations require that internal charge cycle to map the cell's discharge curve correctly for the battery-remaining display to read accurately.

Battery percentage jumping erratically on the DC-5300 display

The DC-5300 estimates remaining charge by reading cell voltage against a stored discharge curve. A new third-party cell has a slightly different discharge profile than the OEM cell the camera was calibrated for. Until the camera BMS maps the new curve, the percentage indicator can jump — showing 80%, then 40%, then back to 60% within a few frames. One full discharge-to-cutoff followed by a full charge, done inside the camera body, gives the BMS enough data to stabilise the reading. After that cycle, the indicator tracks the actual charge level within a few percentage points.

Flash not fully recycling between shots on a new cell

The built-in flash on the DC-5300 pulls a short high-current spike to recharge the capacitor between exposures. If the cell voltage sags under that spike — common late in a cell's life or on a cell that hasn't been fully charged — recycle time stretches and back-to-back flash shots produce underexposed frames. Check cell voltage before a shooting session: a fully charged 3.7V Li-ion cell should read between 4.1V and 4.2V at rest. If the cell reads below 3.9V before you start shooting, recharge it fully before relying on flash.