Battery harness kit includes battery wire harness and battery jumper wire. Compatible only with the original Invacare At'm. Not compatible with the Invacare At'm QT.
Yes, there is a breaker switch on the part that connects to one of the positive battery terminals. If you want to take a look at the owners manual for the Invacare At'm Take Along Chair, there is a picture of how the battery harness is hooked up on page 7: http://manuals.monsterscooterparts.com/mobility/Invacare/manual-invacare-atm-qt.pdf