About this replacement
Samsung VP-DX100i / VP-D381 Series — 7.4V Li-ion Replacement Battery (IA-BP80W)
This is a 7.4V, 800mAh Li-ion replacement for the Samsung IA-BP80W battery. It fits the VP-DX100i, VP-D381, VP-DX105i, and SC-D385 compact camcorders. The cell matches the original voltage rail and connector footprint for those models.
- VP-DX100i and VP-D381 series compatibility: These models share the same battery bay geometry, 7.4V nominal rail, and IA-BP80W connector pinout. The BMS handshake on each body reads the same cell identification — one battery covers the full group.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a VP-DX100i body. The BMS accepted the cell without error, reported charge status through the indicator, and held voltage above 6.8V through the working discharge range.
- First-cycle initialisation on the VP-DX100i: Run the first full charge inside the camera body or the OEM Samsung charger rather than a generic third-party charger. The VP-DX100i BMS maps battery-remaining percentage against the cell's discharge curve during that initial cycle — skipping it can cause the indicator to read erratically for several sessions.
Why the VP-DX100i shows a dead-battery icon on a partially charged replacement cell
Samsung's camcorder BMS uses a stored voltage-threshold map to calculate remaining charge. A new cell that hasn't completed a calibration cycle presents a discharge curve the BMS hasn't seen before, so it defaults to low or empty. This isn't a faulty cell — it's a mapping mismatch. Charge the battery to full inside the camera body or OEM charger, then run it down through normal recording use. After one complete cycle, the indicator tracks accurately.
Battery percentage jumping erratically during playback or recording
The VP-DX100i samples cell voltage at brief intervals and maps those readings to percentage steps. A replacement cell with a slightly different discharge curve produces voltage readings that land between the original threshold steps, causing the display to skip or jump. This is most visible in the middle charge range — roughly 40% to 70%. One full charge-discharge cycle inside the camera body re-anchors the threshold map to the new cell. After calibration, the percentage display stabilises and steps down in a consistent pattern.