Join Date: Jan 2011
Location: Cambridge IL - USA
If the vehicle can be jump started, as per the owners manual; then it can be charged without removing the cables also.
The procedure should include turning off the ignition and any accessories first.
The use of one of the newer smart chargers; ones that have reverse polarity protection would be advisable.
If using a higher amperage output charger, and you only intend to use it for a maintainer; select the lowest output, and when it is charged fully will automatically transition to the float mode which typically maintains ~13.2 volts.
I have a pigtail installed on all of my vehicles that will accept a float mode/maintainer/charger. I don't use my higher amp chargers for this purpose, but you definitely can.
I use the Battery Tender Plus as my maintainer; puts out one and a half amps to charge, then goes into maintenance mode. I have four other off brand float mode maintainers that I occasionally use, but monitor them more frequently as I don't fully trust them.
You may wish to invest in a dedicated maintainer vs using a larger charger if all you wish to do is maintain the battery. Larger chargers often have a fan that operates all the time, and is overkill for using as a maintainer.
If you do ever need to charge a dead battery that's installed in your vehicle; then I would recommend disconnecting the battery cables prior to charging.
2019 Chevy Equinox; 2.0 - LT - FWD - Silver Ice/Redline - Purchased 10/20/2018; Mills Chevrolet, Davenport IA
2016 Chevy Equinox; 3.6 - LTZ-AWD - Black/Black - Purchased 7/7/2016; Mills Chevrolet, Davenport IA
2017 Chevy Malibu; 1.5 - LT - Pepperdust - Purchased 8/2017; Green Chevrolet, East Moline, IL
2009 Chevy Silverado; 5.3 -LT - 4WD - Ext. Cab - Granite Met. - Purchased 02/2009; Green Chevrolet, East Moline IL