Dead as in... did you test at the battery terminals with a voltmeter or dead as in no lights no crank?
Deep cycle? Lead acid or AGM?
Side post connections have to be the worse design ever for maintaining good connections...freaking 2019 you think they could do better.
Iíve had batteries drain completely and never take a charge again.
Bought in 12/18? Take them out and have the place you bought them from load test and/or just warranty them out for new ones.
2002 K3500 LS CrewCab 4x4 DRW Turbo Diesel
1997 C3500 HD DRW (
not a diesel, but is a dually!)
1998 K3500 CrewCab 4x4 DRW Turbo Diesel SOLD
#1162 Dually Club