About this replacement
Sony HDR-TG1 / DSC-HX1 Series — 7.4V Li-ion Replacement Battery (NP-FV90)
This is a 7.4V, 2200mAh lithium-ion replacement for the Sony NP-FV90 battery. It fits a broad range of Sony camcorders and cameras including the HDR-TG1, HDR-TG3E, HDR-TG5, and DSC-HX1. Capacity matches the OEM specification at 16.28Wh.
- HDR-TG and DSC-HX platform compatibility: These models share the same 7.4V InfoLITHIUM battery bay, connector pinout, and BMS handshake protocol — which is why one NP-FV90 cell spans both camcorder and camera bodies in this lineup.
- Bench tested on actual hardware: We cycled this cell through the HDR-TG1 body and a Sony OEM charger. The BMS handshake completed on first connection, charge acceptance was normal, and the InfoLITHIUM remaining-time display stabilised after one full charge cycle.
- First-cycle requirement on InfoLITHIUM bodies: Sony's InfoLITHIUM system maps battery percentage against a learned discharge curve. Run the first full charge inside the camera body or OEM charger — not a generic third-party charger — so the body can calibrate the fuel gauge to this cell's specific discharge profile.
Sony InfoLITHIUM BMS rejecting a third-party cell on first install
Sony's InfoLITHIUM protocol requires a handshake between the battery's onboard IC and the camera body before it will display charge state or allow recording. A new third-party cell often enters this handshake in an unknown state, so the body flags it as unreadable rather than defective. Inserting the battery and charging it to full via the Sony OEM charger — or directly through the camera's USB/DC input — initialises the IC correctly. After one complete charge cycle this way, the body accepts the cell and the remaining-time indicator functions normally.
Battery percentage jumping or reading incorrectly on the HDR-TG1 display
The HDR-TG1 maps its on-screen battery percentage to voltage thresholds calibrated against Sony's OEM discharge curve. A replacement cell with a slightly different discharge curve will cause the indicator to jump — for example, dropping from 60% to 20% without warning. This is a display calibration issue, not a cell fault. Run two full charge-discharge cycles through the camera body, and the InfoLITHIUM system re-maps the thresholds to the new cell. After the second cycle, percentage readout should track within a few points of actual remaining capacity.