Battery and Battery Box

JohnG4706 wrote:
OK, took the battery out and brought it back to the house to start charging. Voltage read was 5.5V. Will keep my fingers crossed that I haven't ruined the battery.

Regardless of what happens during charging the battery life is compromised. After charging have the battery load tested to determine if it is/is not toast.

Electrically the switch on + or - doesn't make any difference. But for the same reason that that the neg cable should be removed first and installed last putting the switch on the - terminal is potentially safer.