Medion NP-900 Replacement Battery 3.7V 600mAh Li-ion

Medion MD85700 / MD85867 — 3.7V Li-ion Replacement Battery (NP-900)

This is a 3.7V, 600mAh Li-ion cell that replaces the NP-900 battery in Medion compact digital cameras. It fits the MD85700, MD85867, Life P42012, and MD85801 among others. Slot it in and the camera powers up as it would with the original cell.

• NP-900 platform compatibility: These Medion compacts share the same battery bay dimensions (43.70 × 31.30 × 7.00mm), the same 3.7V nominal rail, and the same contact layout. The BMS in each body reads the same charge profile, so the cell is accepted across the whole range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on NP-900 compatible hardware. The BMS accepted the cell without a fault flag, charge termination triggered correctly at full voltage, and discharge cutoff fired before the cell dropped to an unsafe level.
• First-use charge cycle on the MD85700: Run the first charge through the camera body or OEM charger to its full completion before shooting. Some Medion compact BMS systems use that initial in-body charge cycle to calibrate the battery-remaining display — skipping it can cause the indicator to read erratically from the start.

Dead battery indicator on the MD85700 with a partially charged replacement cell

Medion compact cameras map their battery indicator against a stored discharge curve from the original NP-900. A new third-party cell has a slightly different voltage-versus-capacity curve, especially in the upper charge range. The camera body can misread the state of charge and display a low or dead battery warning even when the cell is holding voltage well above cutoff. This is a display calibration issue, not a cell fault. One full charge-discharge cycle through the camera body usually resets the mapping and brings the indicator back into step with actual capacity.

Battery percentage jumping erratically mid-shoot

If the battery percentage on the MD85700 skips — say, dropping from 60% to 20% in a few frames — the camera's voltage-threshold indicator is misreading the new cell's discharge curve. NP-900 cells from different manufacturers have slightly different mid-discharge voltage plateaus, and the camera firmware thresholds were set for the original cell's profile. The percentage display can stabilise after two or three full charge-discharge cycles as the BMS accumulates data on the new cell's behaviour. If it does not settle after three cycles, check that the battery contact pins in the bay are clean and making full contact — dirty pins cause voltage drop spikes that trigger the same symptom.