Battery for operation without external power source
The product features page (http://www.samsung.com/us/computer/projectors/SP2503XWX/ZA-features) for the M-250 says:
Powerful battery gives long-term reliable operation The powerful battery provides 2.5 hours of continuous operation without an external power supply - enough for presentations and entertainment. Then simply recharge, and it’s ready for more.
But the manuals that came with the product and those for download on the website do not say one word about this feature. Can someone explain this to me?