About this replacement
LG PF50KA — 7.4V Li-ion Replacement Battery (EAC64198204)
This is a 7.4V, 5200mAh Li-ion replacement battery for the LG PF50KA portable projector. It powers the LED light source, image processing board, and onboard cooling during cordless use. Part number EAC64198204 matches the original cell specification and connector configuration for this model.
- PF50KA platform fit: The PF50KA uses a 7.4V two-cell Li-ion pack with a proprietary connector and BMS handshake. This replacement matches that exact cell count, voltage rail, and communication protocol — the projector's power management unit reads state-of-charge correctly from first boot.
- Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the PF50KA. The BMS reported accurate charge percentage throughout, and the projector's low-battery warning triggered at the correct voltage threshold without premature shutdown.
- Brightness mode and current draw: Switch the PF50KA to eco or low-brightness mode when running on battery. Full lamp brightness pulls 30–40% more current than eco mode — the difference in image quality is negligible in most indoor environments, but the impact on available runtime is significant.
Why the PF50KA shuts off before the battery indicator reaches empty
The LED light source in the PF50KA requires a minimum sustained voltage to maintain a stable arc. That cutoff sits higher than the battery's fully depleted voltage. So the projector powers down to protect the lamp while the battery gauge may still show one or two bars remaining. This is normal behaviour and not a fault with the battery or the projector. A degraded original battery accelerates this — cell voltage sags under lamp load even when resting voltage appears acceptable.
PF50KA showing "charging" but battery percentage not increasing
The PF50KA's internal charger expects a Li-ion cell chemistry with a specific charge termination voltage of 8.4V at full capacity. If the replacement pack's BMS trips during the initial charge cycle — typically because cells arrived below 6.0V from storage — the charger can stall in a trickle-charge state that looks like normal charging on screen. Remove the battery, leave it disconnected for two minutes, then reinsert it and begin charging from a cold projector with the unit fully powered off. That resets the BMS handshake and allows the charger to restart the CC/CV sequence from the correct starting point.