battery tender and aux battery
Thread Starter
Junior Member
Joined: May 2006
Posts: 38
Likes: 0
battery tender and aux battery
hello everybody, and thanks in advance for your support.
I have one W204 C250 2013. I use the car a few times in the year, because I usually another car. so, I connect the battery to my battery tender, to keep the battery charged, even when the engine don's start in the whole month.
the question is: I notice that my car has one auxiliary battery located in the trunk, used for eco start / stop system.
I want to know: does the battery tender charge the aux battery simultaneously, when charging the main battery? should I charge the aux battery separately to keep it charged?
any help will be appreciated,
thanks again,
I have one W204 C250 2013. I use the car a few times in the year, because I usually another car. so, I connect the battery to my battery tender, to keep the battery charged, even when the engine don's start in the whole month.
the question is: I notice that my car has one auxiliary battery located in the trunk, used for eco start / stop system.
I want to know: does the battery tender charge the aux battery simultaneously, when charging the main battery? should I charge the aux battery separately to keep it charged?
any help will be appreciated,
thanks again,
Super Member
Joined: Jul 2016
Posts: 502
Likes: 81
From: Newcastle Upon Tyne
W204 C220CDI 2011
When you are charging the main battery put your meter across the aux and see what the voltage is.
Last edited by alecmascot; Aug 17, 2021 at 07:45 AM.
