I connected my Ctek tender 4 days ago and put it on the standard mode for charging. After two days the status light has not moved from charging (half full battery symbol) to fully charged. It was below 41 degrees so I switched modes to the below 41 degree mode. Two days later it still doesn't indicate fully charged. Is this normal?

 

I don't know what model my Ctek is, but it will typically change from charging to full in 5- 8 hours time. This is when the car has sat still (in cold winter storage) for 4-6 weeks since last charging. Temperature (storage and when charging) is typically from 6 below freezing to 5 above frezing.

I have also tried the two different charging modes (normal vs winter), but that does not seem to affect the charging time to full much.

ps: as soon as I open the boot (and drain some current from the battery with the el. boot opening function), the Ctek will swap to charging mode again - so you need to check the status before you do anything that drain current from the battery.

 

CTEK chargers do occasionally do some weird things.

Mine has several menus and battery types and modes to choose from.
I have connected my MX5.0 to the F and come back to it and apparently it hadn't charged after quite a while. Checked that I was in AGM and car not motorbike mode just to make sure.
I have also had lights showing as fully charged, but the battery is drawing current (the Comfort connector was quite hot).

The solution that I found was to disconnect the charger from the car, disconnect it from the mains power and leave it to clear for a minute or so.

Once the residual power has drained from the circuit, it seems to rest itself.
Connect it back to the mains power and then the car - should be fine.

 

Same situation here initially....had the CTEK on for 3+days and still on charging.....took it off, put on a BatteryTender and overnight it was charged and the green light on.
Replaced it with the CTEK and after a few moments on charging it went to fully charged/maintenance and has stayed there for a week or so.
When I went into the trunk ( light on) it went back to charging momentarily.
I like the idea of desulfating but it does seem a little hinky

 

Thanks all, I'll report back after trying your suggestions

 

Well, I did the disconnect and reconnect as suggested and the status light has switched to fully charged. I think I'm all set. Thanks again all for the help!

 

Excellent!