Epson PowerLite 800F 5000-Lumen Pixel-Shift Full HD Ultra-Short Throw Laser 3LCD Projector (White) - Manual (Page 251)

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2. Remove the old batteries.
Warning: If the battery fluid has leaked, wipe it away with a soft cloth and avoid getting the fluid on
your hands. If it gets on your hands, wash them immediately to avoid injury.
3. Insert the batteries with the + and – ends facing as shown.
Warning: Make sure the batteries are inserted in the correct positions. If the batteries are not
inserted correctly, they could explode or leak, causing a fire, injury, or damage to the product.
4. Replace the battery cover and press it down until it clicks into place.