Sylvania SDVD1087 Blu-ray Replacement Battery 7.4V 4000mAh

Sylvania SDVD1087 Blu-ray Player — 7.4V Li-Polymer Replacement Battery (1438145P)

This 7.4V, 4000mAh Li-Polymer battery replaces part number 1438145P in the Sylvania SDVD1087 portable Blu-ray player. It restores cordless operation when the original cell no longer holds a charge. Dimensions are 131.80 x 38.10 x 13.00mm — confirm your original before fitting.

• SDVD1087 compatibility: The SDVD1087 uses a flat Li-Polymer pack with a specific connector orientation and BMS handshake. This replacement matches the OEM voltage rails and cell configuration so the player's protection circuit communicates correctly at startup.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the SDVD1087 platform. The BMS held stable across disc motor spin-up events, which draw peak current well above the steady-state display load. No false cutoffs were recorded during testing.
• Charging while playing: Avoid running the player while it charges. The disc motor, display backlight, and charging current all draw simultaneously — that combined load raises cell temperature and can trigger thermal protection, which reduces available power before the charge cycle completes.

Disc not spinning after battery swap on the SDVD1087

The disc motor on the SDVD1087 pulls a short but sharp current spike at spin-up — higher than anything the display or audio circuit demands. If the replacement cell shipped at storage voltage (around 3.7V per cell), the pack may not deliver enough current to sustain that spike. The BMS interprets this as an overload and cuts output before the disc reaches read speed. A full charge cycle before first use brings both cells to 4.2V each, giving the pack the headroom it needs to clear the spin-up draw.

Screen dimming partway through playback on a new battery

Backlight dimming mid-movie is not a display fault — it is the player's display driver stepping down brightness as pack voltage sags below its threshold. On a new cell this usually means the battery shipped partially discharged and hit the low-voltage floor earlier than expected. It can also occur if the pack temperature climbed from combined disc and display load. Charge the battery fully, let it cool to room temperature, and check that pack voltage reads at least 8.0V before starting playback.