986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - left lights on, killed batt. Charge or replace?

1PorscheBoxster986 · 08-20-2019, 06:55 PM

It sounds like you should replace the battery so good call. The battery is at least 6 years old and will fail over time. If you're using the cigarette battery adapter plug, you do not remove the positive and negative terminal cables off the battery. If you are pulling the battery out of the frunk and charging it out the battery tender via ring terminal harness or alligator clips then yes. You should remove the negative terminal first then remove the positive terminal. Vice versa when installing the new battery. You can always test the battery with a reliable voltmeter to see if it discharges a 14V range but I would just replace the old battery.

08-20-2019, 06:55 PM	#25
1PorscheBoxster986 A Porsche Guy Join Date: Jun 2019 Location: 0° Posts: 135	It sounds like you should replace the battery so good call. The battery is at least 6 years old and will fail over time. If you're using the cigarette battery adapter plug, you do not remove the positive and negative terminal cables off the battery. If you are pulling the battery out of the frunk and charging it out the battery tender via ring terminal harness or alligator clips then yes. You should remove the negative terminal first then remove the positive terminal. Vice versa when installing the new battery. You can always test the battery with a reliable voltmeter to see if it discharges a 14V range but I would just replace the old battery. Last edited by 1PorscheBoxster986; 08-20-2019 at 07:00 PM.