CTEK charging problem

flimper · Post by **flimper** » Sat Apr 21, 2018 11:46 am

I have the CTEK 5.0 and have been charging the M for at least 3 days now and it refuses to budge from 'delsuphirisation' no.1. It did have an red error light on day 1 (so turned off and started again) but nothing since. You would think the battery is knackered but it's working perfectly. Any thoughts?

Adam D · Post by **Adam D** » Sat Apr 21, 2018 5:09 pm

I have had this when trying to charge a battery which was deeply discharged from sitting idle for a long time. Using a non smart charger to get some juice into the battery then allowed the ctek to complete its charging phase.

Would put £150 aside for a new battery

Parapete · Post by **Parapete** » Sat Apr 21, 2018 10:59 pm

+ one for above advise, had same problem battery just needed a little charge to get started. Try Tayna if you need a new battery.

Ducklakeview · Post by **Ducklakeview** » Sun Apr 22, 2018 12:55 am

Disconnect the battery from the car and see if it changes mode. The impedance of the cars circuits can cause it to get a false reading.

Mike

mj2k · Post by **mj2k** » Tue Apr 24, 2018 10:19 am

Very strange, mine needed a new battery last year as was similar.

Weirdly this year when I took it off the CTEK after 6 months, I needed to reset the clock - no idea why I had to do that?!

Perhaps I had forgotten to set it last year

mr.tourette · Post by **mr.tourette** » Tue Apr 24, 2018 11:07 am

If you have croc clips for the ctek try charging the battery off the car..it wont get the initial high level charge it can give when off the car as it only feeds a very low rate to protect the cars delicate electrical system

flimper · Post by **flimper** » Tue Apr 24, 2018 11:14 am

mr.tourette wrote: ↑Tue Apr 24, 2018 11:07 am If you have croc clips for the ctek try charging the battery off the car..it wont get the initial high level charge it can give when off the car as it only feeds a very low rate to protect the cars delicate electrical system

Might give that a go

mj2k · Post by **mj2k** » Tue Apr 24, 2018 8:50 pm

I’m near Reading, if you wanted to borrow my CTEK for a week & eliminate the charger from the mix?

ph001 · Post by **ph001** » Tue Apr 24, 2018 9:39 pm

flimper wrote: ↑Tue Apr 24, 2018 11:14 am If you have croc clips for the ctek try charging the battery off the car..it wont get the initial high level charge it can give when off the car as it only feeds a very low rate to protect the cars delicate electrical system

How does the CTEK know if the battery is connected to the car or not?????

mj2k · Post by **mj2k** » Tue Apr 24, 2018 9:42 pm

ph001 wrote: ↑Tue Apr 24, 2018 9:39 pm
flimper wrote: ↑Tue Apr 24, 2018 11:14 am If you have croc clips for the ctek try charging the battery off the car..it wont get the initial high level charge it can give when off the car as it only feeds a very low rate to protect the cars delicate electrical system
How does the CTEK know if the battery is connected to the car or not?????

I’m assuming it realises there is no draw from the battery from the car’s electrics?

flimper · Post by **flimper** » Tue Apr 24, 2018 11:11 pm

mj2k wrote: ↑Tue Apr 24, 2018 8:50 pm I’m near Reading, if you wanted to borrow my CTEK for a week & eliminate the charger from the mix?

Thanks for the offer but the CTEK is nearly new so can’t see that being the issue. Just in case will test it on the Mini to be 100%

mr.tourette · Post by **mr.tourette** » Wed Apr 25, 2018 6:59 am

ph001 wrote: ↑Tue Apr 24, 2018 9:39 pm
flimper wrote: ↑Tue Apr 24, 2018 11:14 am If you have croc clips for the ctek try charging the battery off the car..it wont get the initial high level charge it can give when off the car as it only feeds a very low rate to protect the cars delicate electrical system
How does the CTEK know if the battery is connected to the car or not?????

Its a smart charger

it knows when the croc clips are connected and runs a different charging sequence to recover the battery

ph001 · Post by **ph001** » Wed Apr 25, 2018 7:13 am

Believe me, there is no way it can tell if the battery is connected to the car or not!

mr.tourette · Post by **mr.tourette** » Wed Apr 25, 2018 9:38 am

ph001 wrote: ↑Wed Apr 25, 2018 7:13 am Believe me, there is no way it can tell if the battery is connected to the car or not!

Quote from my chargers manual "The charger’s TURBO recovery mode cannot engage if it senses that the battery is still connected to a vehicle wiring circuit which effectively offers a lower electrical resistance than the battery on its own"

ph001 · Post by **ph001** » Wed Apr 25, 2018 10:45 am

mr.tourette wrote: ↑Wed Apr 25, 2018 9:38 am Quote from my chargers manual "The charger’s TURBO recovery mode cannot engage if it senses that the battery is still connected to a vehicle wiring circuit which effectively offers a lower electrical resistance than the battery on its own"

Given that the electrical resistance of a car battery on it's own is typically about 0.003 ohms, I find that very hard to believe!

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