Additional battery OOPS
Out Of Control!!
Joined: Apr 2019
Posts: 12,160
Likes: 6,881
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
AUX getting there!
LAUNCH CodeReader shows that as well.
This internal resistance is a calculated value based on drop-voltage and current.
This is saying your AUX has an increasing hard time carrying load but not yet flagged as bad.
This is what battery drain does... basically lead/acid "sulfation".
When main AGM gets drained so does AUX!
AUX does not have any charge current limitation - Once flat it gets roasted by high current to meet ALT voltage.
The bottom line to prevent that:
CTEK Float charger on main AGM.
Last edited by CaliBenzDriver; Jul 31, 2024 at 03:49 PM.
Out Of Control!!
Joined: Apr 2019
Posts: 12,160
Likes: 6,881
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
AGM RECONDITIONING
Yes, you can try after removing the OEM AUX out in a safe place for venting.
Give it an "AGM Mode" deep-cycle battery reconditioning while disconnected from the car.
It won't hurt and may go another 5 years with normalized internal resistance value.
It's a small batt that needs a charger with small charge current option.
Anyway battery status is already going bad so nothing to loose before a replacement down the road.
Give it an "AGM Mode" deep-cycle battery reconditioning while disconnected from the car.
It won't hurt and may go another 5 years with normalized internal resistance value.
It's a small batt that needs a charger with small charge current option.
Anyway battery status is already going bad so nothing to loose before a replacement down the road.
