Medion NP-45 Replacement Battery 3.7V 660mAh Li-ion

Medion Life P86124 Series — 3.7V Li-ion Replacement Battery (NP-45)

This is a 3.7V, 660mAh Li-ion cell built to the NP-45 form factor. It fits the Medion Life P86124 compact digital camera and several related Life series models. Slot it into the battery compartment and it connects to the same charge and discharge circuit as the original cell.

• Life P86121, P86123, P86124, P86308 and more: These models share the NP-45 footprint, contact layout, and 3.7V nominal rail. The BMS in each body reads the same charge termination signal, so one cell type covers the full range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a compatible body. The BMS accepted charge termination at 4.2V and held the low-voltage cutoff without false trips under normal photo-capture load.
• First-cycle calibration on the Medion Life body: Run the first full charge inside the camera body rather than a standalone charger. The Life series maps its battery-remaining display against the cell's discharge curve during that initial cycle — skipping it can cause the indicator to misread remaining capacity from the first shoot.

Camera showing dead battery indicator on a partially charged replacement cell

The Life P86124 uses a voltage-threshold lookup to estimate remaining charge. A new cell that hasn't completed a calibration cycle in the camera body presents a discharge curve the firmware hasn't mapped yet. The body reads the unfamiliar voltage slope as critically low and throws the empty-battery warning even when the cell has charge remaining. Charge the replacement fully via the camera body before shooting — the BMS updates its threshold reference after one complete in-body cycle.

Battery percentage jumping erratically during a shoot

Erratic percentage readings come from a mismatch between the cell's actual discharge curve and the voltage-to-percentage table stored in firmware. This shows up most on replacement cells that differ slightly in internal resistance from the OEM spec. The indicator recalibrates gradually over two or three full charge and discharge cycles. After three full cycles, readings typically stabilise — if they don't, check resting voltage after a full charge with a multimeter; it should sit at 4.18–4.20V.