Fruit Machine Chat

hello folks if you could offer some advice, trying to replace the battery on a mpu5 board see the battery but its soldered in, i guess i need to desolder it from the back, but is there an easy way to remove the actual pcb from the plastic case its clipped on very bloody strong plastic clips, anyone who had replaced a battery on a mpu5 before advise, thanks

everything is clipped in like you said,take the cover off,spring the clips off ,turn the board over and unsolder the battery,simples