Ctek battery charger

Discussion in 'General chat' started by edthefed, Mar 27, 2020.

  1. Postman
    Offline

    Postman

    Joined:
    Aug 24, 2015
    Messages:
    93
    Likes Received:
    27
    Ratings:
    +49 / 0 / -0
    upload_2020-3-27_22-8-22.jpeg

    You may wish to check your assumption that the above is a good state of charge. I checked an odyssey booklet today and it suggested that only indicated roughly a 20% charge state. I checked one of my odyssey batteries and it had nearly the same voltage as yours. Ctek 5.0 has been charging for in excess of 6 hours and it’s not finished yet.
     
  2. Peter
    Offline

    Peter WARLORD Site Supporter

    Joined:
    Aug 5, 2015
    Messages:
    1,444
    Likes Received:
    728
    Location:
    Highland Region
    Ratings:
    +1,111 / 0 / -1
    Can depend how we check the voltage. I've found that a car, when awake, can be 0.5V down on the sleeping voltage. Mine will often read ~11.8V on opening the car and checking the voltage. Leave a lead (from the under bonnet terminals) to the outside, lock and wait for sleeping mode and it will be 12.3V,

    Connect the CTEK at that voltage, will change from bulk to absorption stage (~80% SoC) within an hour. Often to float stage within four hours.

    Peter
     
    • Like Like x 1
  3. Peter
    Offline

    Peter WARLORD Site Supporter

    Joined:
    Aug 5, 2015
    Messages:
    1,444
    Likes Received:
    728
    Location:
    Highland Region
    Ratings:
    +1,111 / 0 / -1
    I had one of the Lidl Ultimate Speed versions, mine died after a few uses on the 330d. Was fine while it worked.

    Peter
     
  4. Postman
    Offline

    Postman

    Joined:
    Aug 24, 2015
    Messages:
    93
    Likes Received:
    27
    Ratings:
    +49 / 0 / -0
    Have to admit I was unaware of the voltage drop. Having said that both forms of transport which have the extreme batteries connected to them aren’t that smart to have a sleep or awake mode (one is even more ancient than oneself :whistling:)
     
  5. Mieke
    Offline

    Mieke WARLORD Site Supporter

    Joined:
    Sep 8, 2015
    Messages:
    2,311
    Likes Received:
    797
    Location:
    Cheshire
    Ratings:
    +1,679 / 2 / -1
    I have an older CTEK MXS - 3.6 which I use occasionally to top up the battery. My F30 has a high capacity AGM battery and I use the recommended "Cold Weather" Mode which charges at 14.7 volts, instead of the "Normal" Mode (14.4 volts). If the car hasn't been used for a while it can take +30 hours to fully charge.
     
  6. Silverbeemer525
    Offline

    Silverbeemer525 Site Supporter

    Joined:
    Dec 28, 2015
    Messages:
    110
    Likes Received:
    22
    Location:
    Hinckley
    Ratings:
    +40 / 1 / -0
    I have a Lidl one but it's an earlier model. There is no AGM mode, just 6/12v, motorcycle/car and low temperature choices. However, for the last few years the electronics have seemed quite temperamental. I need to press the selector button lots of times before it will start to move through the selection sequence, sometimes taking a minute or so to start. As Peter says, modern BMW's only aim for around 75% charge to leave some 'headroom' for big bursts of regenerative charge on overrun and minimising alternator power draw when driving under engine power.

    I am thinking of getting a CTEK. I hope that none of the 'pulsing'/desulphating modes reach a high enough voltage to damage the diodes, or any other electronic circuits?
     
  7. JasonH
    Offline

    JasonH

    Joined:
    Sep 1, 2015
    Messages:
    195
    Likes Received:
    64
    Ratings:
    +99 / 0 / -0
    Only use the cold weather mode if it really is cold. They extra voltage is needed to fully charge the battery at low temperatures but at normal temperatures that extra voltage will damage the battery.
     
    • Informative Informative x 1
  8. JasonH
    Offline

    JasonH

    Joined:
    Sep 1, 2015
    Messages:
    195
    Likes Received:
    64
    Ratings:
    +99 / 0 / -0
    Yes you do need to check that the charger never puts out more than 15V to be safe. Older desuphating chargers could hit 19V. On a modern BMW you could destroy a lot of modules/ECUs with 19V. My E61 has something like 37 electronic control units, feed the car 19V and it would probably write the car off.
     
    • Informative Informative x 1
  9. JasonH
    Offline

    JasonH

    Joined:
    Sep 1, 2015
    Messages:
    195
    Likes Received:
    64
    Ratings:
    +99 / 0 / -0
    The "voltage drop" is due to how you are measuring the battery voltage.

    Under load - with the ignition on or having recently opened the door - the voltage will be much lower, it all depends on the load. When the car is starting the voltage could even dip below 11V and that's OK.

    To measure the state of charge or condition of a lead acid (or AGM) you really need the "float voltage" that's with the battery disconnected. When the car is asleep is as close as you'll get to this (at this point the car should be drawing less than 80mA). Now you can determine the charge level, it depends a bit on temperature and whether it's AGM or lead acid but in general:

    12.7V Really good
    12.5V OK
    12.0V or under it needs charging
     
    • Informative Informative x 1
  10. 535i MSport
    Offline

    535i MSport Site Supporter

    Joined:
    May 16, 2018
    Messages:
    293
    Likes Received:
    122
    Ratings:
    +147 / 0 / -0
    I have an MXS 5.0

    I did a deep charge - or whatever it’s called - and it took the best part of 24 hours on my car.

    Thanks for the reminder, I should probably give it a trickle tomorrow...

    The MB needs it, as with the “hot Vee” the fan often runs after switch off.


    Sent from my iPhone using Tapatalk
     
  11. 535i MSport
    Offline

    535i MSport Site Supporter

    Joined:
    May 16, 2018
    Messages:
    293
    Likes Received:
    122
    Ratings:
    +147 / 0 / -0
    Congrats on the multi meter!




    Sent from my iPhone using Tapatalk
     
    • Like Like x 1
  12. Wynne71
    Offline

    Wynne71 Site Supporter

    Joined:
    Apr 3, 2019
    Messages:
    781
    Likes Received:
    255
    Location:
    West Midlands
    Ratings:
    +366 / 0 / -1
    Ha, thanks. Got there in the end!
     
  13. zarnd
    Offline

    zarnd

    Joined:
    Oct 3, 2016
    Messages:
    666
    Likes Received:
    313
    Location:
    Kent
    Ratings:
    +390 / 0 / -0
    I have two MXS 5.0’s. I have my M5 and SL55 permanently plugged in charging due to lack of use. Would recommend them to be honest, have both been very good.

    Got to get one for another car as it is sitting not being used as well now.

    On both of mine I have the LED connector that I have hardwired to the battery or the charging terminals to make life easier.

    Cheers


    Sent from my iPhone using Tapatalk
     
  14. 535i MSport
    Offline

    535i MSport Site Supporter

    Joined:
    May 16, 2018
    Messages:
    293
    Likes Received:
    122
    Ratings:
    +147 / 0 / -0
    [​IMG]

    Job done, battery topped off.


    Sent from my iPhone using Tapatalk
     
    • Like Like x 1
  15. Kev2005
    Offline

    Kev2005 WARLORD Site Supporter Good Egg

    Joined:
    Aug 10, 2015
    Messages:
    1,419
    Likes Received:
    249
    Ratings:
    +382 / 0 / -1
     
  16. 535i MSport
    Offline

    535i MSport Site Supporter

    Joined:
    May 16, 2018
    Messages:
    293
    Likes Received:
    122
    Ratings:
    +147 / 0 / -0
    It’s Mercedes Me. I have a CTEK msx 5.0


    Sent from my iPhone using Tapatalk
     
    • Like Like x 1
  17. Kev2005
    Offline

    Kev2005 WARLORD Site Supporter Good Egg

    Joined:
    Aug 10, 2015
    Messages:
    1,419
    Likes Received:
    249
    Ratings:
    +382 / 0 / -1
    I had another look at these, seems these are main options:-

    MXS 5.0
    MXS 5.0 test & charge
    MXS 7.0
    MXS 10

    Which one do guys recommend? Do yo guys have MXS 5.0 or MXS 5.0 test & charge?

    need to check what battery mine has, it know its a AGM battery but not sure on the Ah, i presume 90s but i'd have to check.

    Thanks

    Kevin
     
  18. 535i MSport
    Offline

    535i MSport Site Supporter

    Joined:
    May 16, 2018
    Messages:
    293
    Likes Received:
    122
    Ratings:
    +147 / 0 / -0
    Mine’s just the 5.0. I only wanted it to charge the battery and not do the alternator test etc.

    My car is a 4litre V8, and I believe the battery is 70Ah AGM.


    Sent from my iPhone using Tapatalk
     
  19. edthefed
    Offline

    edthefed Site Supporter

    Joined:
    Sep 19, 2015
    Messages:
    348
    Likes Received:
    116
    Ratings:
    +198 / 1 / -0
    Kev

    Following the advice on here I've gone for the MXS 7.0....that's for a 520d and a petrol X1.
    I will get them both charged and then probably put one car away in the garage for a couple of weeks , and use the other when needed, then swap them over each fortnight.
    £99,99 from Halfords with free delivery. Ordered on line last Friday and just had a text to say it will be delivered this afternoon.
     
    • Like Like x 1
  20. Kev2005
    Offline

    Kev2005 WARLORD Site Supporter Good Egg

    Joined:
    Aug 10, 2015
    Messages:
    1,419
    Likes Received:
    249
    Ratings:
    +382 / 0 / -1
    hmm 70Ah wow maybe i got mine wrong.. will have to check.

    Will take a look, need to find out what size battery a Focus has so can use it on both cars..

    Thanks

    Kev
     

Share This Page