Thread: Mixing battery types

Originally Posted by wbowner

mechanic is recommending an Exide non AGM

Not directly answering but why? This seems like a bad idea.
Typically the older calcium batteries get replaced with AGM and the newer models come with AGM from factory.

Scott

From memory I'm pretty sure Drivesafe said it wasn't that critical, I remember worrying about this myself when Tim reassured me it was fine.

We added an extra battery when we were in the Kimberley as the Yellow Top we had wasn't coping running a fridge and freezer it is your typical lead acid deep cycle battery.

Baz.

Talked to Tim and he confirmed it is ok

Also confirmed to leave my ctek charger on agm even though not charging an agm directly

The reason the mechanic gave me was that the AGM run to hot under the bonnet and the calcium are the better options

Big difference in cost so hope it is true


Richard

Originally Posted by wbowner

The reason the mechanic gave me was that the AGM run to hot under the bonnet and the calcium are the better options

Did Tim have a view on this?

Originally Posted by LRD414

Did Tim have a view on this?

Asked why as well but said it would be OK.

Would I need to get my BMS settings changed if this is done.

Richard

The Traxide should cope fine connecting two different types of batteries. I have a starting battery and an AGM connected by a Traxide and no issues.

Originally Posted by wbowner

...My main battery is a bit stuffed and mechanic is recommending an Exide non AGM

Is this ok? If done do I have to gerlt them to reset something in the car

Within the bowels of the GAP IID tool there are 2 options to set when replacing batteries. No idea of how critical this is but they are there, so must be there for some reason.

Originally Posted by LRD414

Not directly answering but why? This seems like a bad idea.
Typically the older calcium batteries get replaced with AGM and the newer models come with AGM from factory.

Scott

Yes, The flooded cell batteries which were originally fitted to the early model D4s often failed early. Mine did and others reported on it here and the UK forum. Was speculated this was due to short driving trips and possibly the way the D4 charging system worked. When they failed under warranty they were replaced by LR with AGM batteries. I think this was because AGM accepted charge faster.

And because AGM batteries can sustain being taken to lower voltages without damage. The Discovery isn’t kind on batteries and use a lot of power when offline, so drop lower. Depending on the usage of the vehicle this isn’t an issue as it’s never left long enough to drop low enough. AGM are however more sensitive to temperature so it’s a balancing act. Your vehicle usage pattern will dictate the most appropriate solution