Use of battery tenders?

Asked by Richard Jul 17, 2022 at 04:56 PM about the 2009 Mercedes-Benz SL-Class SL 550

Question type: Maintenance & Repair

Does putting a battery tender on only the starter circuit battery also charge the
consumables battery?

2 Answers
25,775

taver91 answered about a year ago

Probably not. The purpose of the starter battery is to provide enough power to crank the engine. Then the other battery will recharge as necessary to provide the functions that is supposed to.

2 people found this helpful.
Mark helpful
197,005

Ed92626 answered about a year ago

the two batteries, primary and secondary, are connected to the alternator. But they are separate circuits. You can charge the main battery using the charge-blade under the hood. But you have to access the secondary battery to charge it.

2 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Use of battery tenders? 2 Answers

    Does putting a battery tender on only the starter circuit battery also charge the consumables battery?

    2009 Mercedes-Benz SL-Class SL 550

    -

    Maintenance & Repair

  • Location of battery in 1997 Mercedes Sl500 6 Answers

    So the battery died and I got a friend to help me recharge it. We couldn't find the battery though, so we googled its location. It appears to be on the top left side, under the hood, but it looks li...

    1997 Mercedes-Benz SL-Class

    -

    Maintenance & Repair

  • replaced battery but battery light on 1 Answer

    i replaced battery in car but now battery light is on

    1987 Mercedes-Benz SL-Class 560SL

    -

    Maintenance & Repair

  • 1999 Mercedes SL500 Battery Maintainer 1 Answer

    I know the battery maintainer goes on the battery in the trunk of my 1999 Mercedes SL500....but how do I get the cord(with the plug) out of the trunk to the wall socket without closing the trunk(no ...

    1999 Mercedes-Benz SL-Class SL 500

    -

    Maintenance & Repair

  • How to replaced the battery 3 Answers

    How to replaced the battery

    1998 Mercedes-Benz SL-Class SL 500

    -

    Maintenance & Repair

Own this car?

Share your experience with others.

2009 Mercedes-Benz SL-Class

Write a car review

Review another car

Shortcuts

Search Mercedes-Benz SL-Class Questions

CarGurus Experts

  • #1
    bobkat
    Reputation
    2,540
  • #2
    Michael Kane
    Reputation
    700
  • #3
    twhobie
    Reputation
    690
View All

Know more, shop wisely

Search

Related Models For Sale

Used Mercedes-Benz S-Class
329 Great Deals out of 5,981 listings starting at $2,495
Used Mercedes-Benz E-Class
639 Great Deals out of 11,959 listings starting at $1,995
Used Chevrolet Corvette
841 Great Deals out of 10,393 listings starting at $5,821
Used Porsche 911
391 Great Deals out of 3,904 listings starting at $16,995
Used Mercedes-Benz SLK-Class
45 Great Deals out of 645 listings starting at $3,999
Used Mercedes-Benz C-Class
842 Great Deals out of 13,246 listings starting at $1,985
Used Mercedes-Benz CLS-Class
92 Great Deals out of 1,526 listings starting at $5,000
Used Mercedes-Benz CL-Class
13 Great Deals out of 242 listings starting at $4,950
Used Mercedes-Benz G-Class
124 Great Deals out of 2,034 listings starting at $26,480
Used Mercedes-Benz CLK-Class
19 Great Deals out of 432 listings starting at $3,133
Used Porsche Panamera
144 Great Deals out of 1,459 listings starting at $8,995

Used Cars For Sale

2018 Mercedes-Benz SL-Class SL 550 For Sale
3 Great Deals out of 18 listings starting at $42,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.