[ghstm2]

I recently purchased this battery charger and can't find anything on which mode is best to use for my 2018 M2. Would using the picture of the car be OK or should I select the AGM function to keep the battery topped off? Or is it ctek smart enough to charge based on what battery your vehicle has? Thanks!

[atomsapple]

You're good I have the same one and charge my X3 and M2 with the regular car setting.

[RideM]

I have the same one, it's car and AGM

[ghstm2]

Originally Posted by atomsapple

You're good I have the same one and charge my X3 and M2 with the regular car setting.

Appreciate it! What year is your X3? I have a 2020 and I think it also uses the AGM battery?

[chris719]

We went through this somewhere in a real ugly thread, lol. If you are charging in a warm environment above 70F I would pick normal. If below I would opt for AGM. The normal mode is most likely the optimal one for the OEM battery, however, it depends on several factors including temperature. Neither mode is unsafe.

[F87source]

Originally Posted by chris719

We went through this somewhere in a real ugly thread, lol. If you are charging in a warm environment above 70F I would pick normal. If below I would opt for AGM. The normal mode is most likely the optimal one for the OEM battery, however, it depends on several factors including temperature. Neither mode is unsafe.

+1

I also found some emails from varta (an oem bmw battery supplier for these cars) and they said that they require the voltages to be in the ranges provided only via agm mode, for their batteries to be properly charged (also in said ugly battery tender thread). But again like Chris said this is also tied to temp, and if it is hot outside then you should go with a lower voltage mode just to be safe. But if it is going through a cold winter storage then AGM mode is the way to go.

[ghstm2]

Originally Posted by F87source

+1

I also found some emails from varta (an oem bmw battery supplier for these cars) and they said that they require the voltages to be in the ranges provided only via agm mode, for their batteries to be properly charged (also in said ugly battery tender thread). But again like Chris said this is also tied to temp, and if it is hot outside then you should go with a lower voltage mode just to be safe. But if it is going through a cold winter storage then AGM mode is the way to go.

So, if I'm understanding this correctly, no need to select the AGM mode on the tender for our vehicles? I can just select the picture of the car? Or should it be the car and agm thats selected? Trying to make sure I don't mess anything up. Thanks!

[F87source]

Originally Posted by ghstm2

So, if I'm understanding this correctly, no need to select the AGM mode on the tender for our vehicles? I can just select the picture of the car? Or should it be the car and agm thats selected? Trying to make sure I don't mess anything up. Thanks!

If it's really hot out side so 25°C and up use the car.

If it's cold/winter then use agm mode, this is what your battery needs to be properly charged to the manufacturer's spec (varta)

[Daytona_550]

I run mine on AGM mode to match the battery in my vehicle. If the charger has automatic temperature compensation, why the concern for whether it is hot or cold?

Specs: https://www.ctek.com/uk/battery-char...24v/mxs-5-0-uk