About this replacement
Dual DVD-P702 — 7.4V Li-Polymer Replacement Battery (MC742819231)
This 7.4V, 1800mAh lithium-polymer battery replaces the original pack in the Dual DVD-P702 portable DVD player. It restores portable playback when the factory battery no longer holds a charge. Capacity and voltage match OEM spec MC742819231 exactly.
- DVD-P702 fit: The DVD-P702 runs a 7.4V two-cell Li-Polymer architecture shared across this Dual portable player line. The connector and cell arrangement match the OEM pack, so the BMS handshake completes without errors on first boot.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on a DVD-P702 unit. The BMS held voltage steady through disc spin-up, display backlight load, and audio output simultaneously — no cutoff events triggered.
- Simultaneous charging and playback: Avoid running the player while it charges. The disc motor, backlight, and charging current all draw at the same time — that combined load raises cell temperature and can cause the thermal protection circuit to reduce available current before the battery is full.
Why the DVD-P702 disc stops spinning shortly after a new battery install
A lithium-polymer cell ships at storage voltage — typically around 3.7V per cell, not the 4.2V peak it needs to deliver full current. At storage voltage, the disc motor's spin-up surge can exceed what the BMS will supply, so it cuts the load instead of risking an over-current fault. This shows up as the disc stalling or the tray refusing to read. Charge the battery fully before the first use — confirmed green on the charger — and the spin-up current draw stays within BMS limits.
Screen dimming mid-movie on a battery that still shows charge
The DVD-P702 display driver monitors the supply rail and reduces backlight power when voltage sags below a set threshold — even if the battery indicator hasn't dropped yet. This happens when the cell can no longer sustain the combined current draw of the disc motor plus the display at full brightness. It's a voltage sag symptom, not a capacity symptom. If dimming starts early in playback, check that the battery contacts are clean and the pack is seated fully — a loose connection increases resistance and accelerates the voltage drop.