Washinglee Q USB PLC Programming Cable, for Mitsubishi Q Series, Enhanced USB-QC30R2 Replacement, FTDI chip, Isolated Interface, 6 FT, Yellow. (USB-QC30R2 Plus)

you this is the procedure for changing battery on a q-series PLC you start with the PLC in run mode and powered up and then you access the battery compartment on the bottom of the processor comes completely out and the clip comes away from the main housing now you just unplug the battery and you've got three minutes to change it without losing the program you will get a battery alarm on the processor so you get your new battery clip it in like that and then the clip slides into the housing and then the whole thing cooks back in like that now to reset the battery alarm open the front door and move the little key over to the reset till he goes off and then back to run again and you've replaced the battery and that's it