Will the pictures be lost if the battery is removed?

No. The pictures are stored on the SD Memory Card.

hi hello i have need to help what should i do my camera digital ezonic opus 4000 is not work now in taken picture is not save into the photography i dont know why i hope somebody help me and give that ideas thanks

what kind of batteries are the best for this camera? the triple A but what brand?

If you remove the battery, the photos will still be on the compact flash card. ***BUT, if you are taking a bunch of photos and the camera is writing the photos from the buffer to the compact flash memory card and you remove the battery while it is doing this (let alone, just opening the battery compartment) it will stop the writing and those photos not copied over WILL be lost. You can tell if the camera is writing to the memory card if the red light is flashing on the back (to the lower right of the direction pad). Best bet is to turn the camera off first, and if that red light is still blinking when you have the power off and the LCD display (not the color one, but the one with info above it) will show your photo remaining count and have a progress bar counting down), once that is done, THEN remove the battery.

Yes,If you have a memory Card It will not erase them,Otherwise it will.

It depends - if using internal memory, then answer is YES. But if you save them to the CompaCtFlash card they won't be lost.