Sony NP-FP90 Handycam Replacement Battery 7.4V 2100mAh

Sony DCR-HC28E / DCR-DVD92 Series — 7.4V Li-ion Replacement Battery (NP-FP90)

This is a 7.4V, 2100mAh Li-ion replacement for the Sony NP-FP90 battery pack. It fits the DCR-HC28E, DCR-DVD92, DCR-HC42, DVD905, and 37 additional Sony Handycam models. The cell format, connector, and BMS communication pins match the original pack geometry exactly.

• Handycam FP-series platform fit: Sony's FP-series Handycam models share a common battery bay and communication rail. The NP-FP90 and NP-FP91 OEM numbers both appear across this cluster because Sony released the same physical pack under two part numbers across production runs — this replacement covers both.
• Bench tested on actual hardware: We cycled this cell through a DCR-HC28E body and monitored BMS handshake, charge acceptance, and cutoff behaviour. The protection circuit held at the correct low-voltage floor and the camera body accepted the cell without error flags on the display.
• First charge via camera body: Some Sony Handycam BMS systems map the battery-remaining indicator against a reference charge cycle completed inside the camera body itself. Run the first full charge through the camera or OEM charger — not a third-party multi-charger — so the display calibrates correctly from the first session.

Sony Handycam BMS rejecting a third-party cell on first install

Sony's FP-series BMS performs an authentication handshake when a new cell is inserted. If the camera body doesn't recognise the cell immediately, it may show a blinking battery icon or refuse to power on. This is a firmware-level check, not a cell fault. Remove the battery, reinsert it firmly, then place the camera on charge for a full cycle — most bodies accept the cell after one completed charge from the camera's own charging circuit.

Battery percentage jumping erratically during recording

The DCR-HC28E maps its remaining-charge display to voltage thresholds calibrated against the original NP-FP90 discharge curve. A new replacement cell may discharge along a slightly different curve, causing the indicator to jump — for example, dropping from 60% to 20% with no warning. This is a display calibration issue, not a capacity problem. Run two full charge and discharge cycles through the camera body and the indicator will stabilise as the BMS learns the new cell's curve. After conditioning, the display should track within normal tolerance down to the 7.0V low-voltage cutoff.