2021 GLE 450 Battery Charging
Thread Starter
Senior Member
Joined: Jun 2011
Posts: 356
Likes: 103
2021 GLE 450
You place the positive and negative clips to the posts under the hood. It is directly connected to the 12 volt AGM and then over to the 48 volt battery via the voltage converter.
Toban
Toban
Member
Joined: Dec 2020
Posts: 79
Likes: 28
2021 GLE 450
Thread Starter
Senior Member
Joined: Jun 2011
Posts: 356
Likes: 103
2021 GLE 450
Yes, that is correct, you use the positive/negative posts under the engine hood. This is where you can hook up your CTEK charger. The 12 volt AGM battery is a constant draw on the 48 volt battery. On my GLE 450, the AGM will go down to 12.5 volts over a period of time and an hour later it’s back up to 12.8/9. This is why if the car sits for awhile, you should put a battery charger on to maintain the batteries.
Toban
Toban
MBWorld Fanatic!
Joined: Oct 2009
Posts: 7,007
Likes: 2,198
From: Colorado
'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
Yes, that is correct, you use the positive/negative posts under the engine hood. This is where you can hook up your CTEK charger. The 12 volt AGM battery is a constant draw on the 48 volt battery. On my GLE 450, the AGM will go down to 12.5 volts over a period of time and an hour later it’s back up to 12.8/9. This is why if the car sits for awhile, you should put a battery charger on to maintain the batteries.
Toban
Toban
CTEK is only one brand. The long-term leader in the field is Deltran's Battery Tender. Despite the merchandising claims of CTEK, the features are relatively the same.
