Even here the chances of achieving a long service life for the battery are unlikely. The charger should react by switching on and off frequently as the voltage drops so rapidly. You can also measure the voltage here with the charger disconnected, but the voltage will now drop instead quickly down to 12V or lower. A sulphated battery, see Charger Academy – Sulphating can also behave in this way with the sulphated layer being insulating and allowing no current through. If it has lost fluid, the top of the battery’s plate surface may be oxidized and thereby destroyed. If the voltage remains at 13V or more, this is the likely explanation. Measure the battery voltage with the charger disconnected. This can be compared to a 50Ah battery having been converted to a 20Ah, for example. This should express itself in such a way that when you disconnect the charger, the battery remains at a relatively high voltage. Specially sealed batteries that have lost fluid can behave in such a way that they increase in voltage but there is no capacity left. The behavior of the charger can be explained in two ways from the point of view of the battery: a. The charger switches quickly to maintenance charge without reaching capacity in the battery.Ī. The difference between these two methods of checking if the battery is fully charged is marginal. If you press the Mode button instead, the charger checks if the battery voltage exceeds around 12.9V in which case the charger considers the battery to be fully charged. When the battery is fully charged, the current is low and the charger automatically switches to “green”. The voltage is then locked while the current reduces. The charger starts with a constant current until the battery is up to maximum voltage. When I press the MODE button a number of times or if I cut the power supply temporarily, the green lamp lights.Ī. Are there any more tips that you can give boat owners looking for a hassle-free summer when it comes to battery charging?.CTEK has a DC/DC charger that seems really good, but how does it work and when do I need one?.Is there any difference between marine chargers and other chargers? Some CTEK chargers are a lot cheaper than CTEK’s marine chargers.What should be considered when choosing a battery charger for a boat?.Is this correct? I thought the COMFORT INDICATOR would flash green? When attached to my car battery, the red light flashes even after charging my battery with my CTEK MULTI US 3300 and it is indicating green light (for fully charged). I have a COMFORT INDICATOR and would like some advise.One supplier recommends the MULTI US 3300 only up to 75Ah, yet the box says 120Ah.Are there CTEK chargers available for other battery types?.What’s the difference between MULTI US 3300 and ZAFIR 90?.How can I charge as quickly and effectively as other chargers? What’s the difference between Coulombi Chargers and CTEK?.Where can I get a copy of the user manual?.Where can I buy a charger? Can I buy directly from you?.The MULTI US 25000/MULTI XT 14000 does not have the higher voltage recommended for brands like Optima.Does a CTEK charger remember the settings if you disconnect from the mains supply?.Can I charge a 24V system with two serial connected 12V chargers?.How drained can a battery be before it cannot be charged by a CTEK charger?.Why does it take less time to charge with a MULTI US 3300 with just 3.6A compared to my old 11A charger?.What does ripple mean and how does it affect the battery?.What happens if I use the charger on batteries larger than you have recommended?.Can you really connect and then forget about the charger?. ![]()
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