You likely will not need any kind of reset chip after you put new batteries in, especially if you do not intend to enable the bill validators.
The exact steps depend on what (if any) error messages appear after you change the batteries, but to get past most of the error messages on a PE+ machine, open the door, press and hold the white self test button for about five seconds, then release it. Close the door (including the belly door under the armrest or the machine will not recognize the door as being closed), then turn and release the jackpot reset keyswitch once. If another error appears, open the door and repeat the process.