mke wrote:

I hope this is the right place to post this. Please forgive me if not.

I think I need to replace the battery on my 2010 D4 as it generally seems too sluggish for my liking when first starting the vehicle in this colder weather, and this morning, after just getting it out of the garage to wash it and generally try to clean it up a bit inside and out (about two hours - perhaps slightly longer - with the doors opening and closing a few times as necessary to clean around them, and the tailgate open for a while, but no radio on, or anything like that) there wasn't enough power to start the vehicle to put it away again when it started to rain just as I finished! I was wondering if anyone had any recommendations about which type and size of battery to use as a replacement?

Because my work is seasonal and I don't use it much during those busy times of year, my vehicle goes for quite long periods not being used, and given the drain on the battery from the various bits and pieces that can never shut down even when the vehicle is locked (key-less locking, remote pre-heater module, etc., all of which must be 'live' and waiting to detect their activating signal and thus gently draining the battery) my normal inclination would be to fit as high an amp hour battery as the holder can take, rather than another 90 amp hour one as fitted originally by Land Rover. But someone said that, whilst that would have been the thing to do with an older, less sophisticated, vehicle, with modern vehicles using so many computers and similar gizmos to run them, and smart computer controlled charging, there could, potentially, be a problem if a vastly different size battery was used, so check first before buying a larger capacity battery.

I haven't a clue about these things, but having read many topics on here and seen how helpful everyone is, I can think of no better place to ask this question and get reliable advice and information!

I look forward to the replies flooding in!

I have a Fiamm Black Titanium battery in my D3, I had an Exide in my D4. Since you’re UK based I’ve noticed that most people seem to like Tayna for some reason. The battery type you want is a 019. You want as many cold cranking amps (CCA) as possible, usually. You can verify what I wrote by going to some battery manufacturer’s or reseller’s site and enter your vehicle details.

Before doing that it might make sense to check how good/bad your current battery actually is. IDK how long you can keep a new battery charged without actually driving but 3 weeks is what I’ve done and it worked all right. This could probably be calculated/estimated if you knew the vehicles’s power draw.