i put a brand-new battery in and have had it on every waking second for the past for 3 days . I have it snowflake mode which is evidently recommended for AGM batteries . It's still showing it's charging it is not switching to maintenance mode which would indicate full charge and just maintenance . I was curious so I hooked the diehard charger up with the charge indicator and after 20 minutes that showed full charge . That was at 2 Amps. I don't get why the Ctek won't switch to maintenance mode which indicates full charge or over 12.9v??

 

Leave mine in normal mode and yes it never seems to do maintenance, yet after 5+ years on two different Bentley cars all has been fine.

 

Appreciate it makes me feel better like my car is not some odd battery sucking vortex lol

 

It saves that for your bank account