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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816   
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Good evening,
I have a standard genuine battery in my Puma, a new one since two or three years ago if I remember well. In the beginning if I occasionally connected my MXS5.0 charger to it, it would fully charge the battery in about 1 hour or so. These days, leaving the truck rarely used in the winter it is quite different. The charger will fully charge the battery, which then will show about 12.5 V when checking a day later. In about a week at rest the voltage will have dropped to 12.3V which guess is not too bad. But what I can’t understand is that the MXS5.0 will now need about 6 to 8 hours charging time before showing that battery is full. Sounds long to me, don’t really understand. Truck is electrically very standard, no electric guzzling gimmicks added. If I decide to use it before recharging after a week of inactivity, no sign of a weak battery at all. Any explanation why I have these long charging times in the normal car charging mode on the MXS5.0? Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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24th Feb 2020 7:39pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
spec for your battery and charger - for 110Ah battery 26hr for 80% charge state down to 20c-
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24th Feb 2020 7:49pm |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816
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Spec for my battery is a Varta 90Ah. The same as the factory installed one. The charger is the Ctek MXS5.0, so should charge at upto 5Ah. I just don’t understand why charging from 12.3V back up to 12.5/12.6V now takes 6 to 8 hours. I know the Ctek won’t charge continuously at 5Ah during that period, but still it seems long to me.
Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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24th Feb 2020 9:22pm |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831  
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I regularly charge up the 110amp batteries for the caravan, I noticed when I switched from a "normal charger" to a Ctek that it took longer to reach fully charged. The explanation I have been given is that the Ctek senses that the battery is almost fully charged and backs off so not to boil the battery. Don't make old people mad.
We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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25th Feb 2020 9:35am |
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 719  
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I think this is normal behaviour for the CTEK. I have the same charger as you and also noticed that it takes longer to charge from 75% full than from 50% full. I haven't taken voltage readings though, just going from my guesstimate of battery charge.
I also leave the charger connected for long periods and the charger goes into "maintain charge" mode with the final green light coming on. Don't think you have a problem if the battery seems ok when starting. Stephen |
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25th Feb 2020 10:16am |
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