ALL the batteries I've ever had with the 'magic eye' have lasted 4 yrs max.
The ones I'm using now are old school, same as the one I replaced that went for 10 years and it wasn't new when I got it.
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Best option for the battery connector on the D2 is to remove the silly connector and replace with a proper connector that can clamp properly.
In the mean time if the connector doesn't clamp the battery post tightly and you can move connector by hand, you can wrap a small sheet of folded foil around the battery post to 'fatten' it up a little to get a bit more clamping force on the battery post.
Then organise a proper connector for the cabling which excludes the original type! Just about every other connector type is better(long term) than what LR thought was a good idea.
If you have an Aux battery, then you have an dual battery isolator of some type. Which type(brand/model).
Some allow for a switch connection that will allow you an easy over-ride method to jump start a dead main(starter) battery ... in future.
Works a treat say if you forget lights on, or some other reason that the start battery simply dies on 'ya.
And don't trust those magic eye doodads either. Like one reply mentions(superhet) they only monitor one cell, and it's always a different cell that dies.
If main battery dies such a death, the over-ride jump start feature of those aux battery manager devices can help(but not guaranteed too).
Also, don't assume your alternator is charging at full whack too, with all the tools you have recently acquired in having entered the LR world ... x2!! [biggrin] ... it's unlikely you don't have a multimeter to check charge voltage whilst you're at it.
When you did all that and car didn't start, did you at least hear the starter relay click on when you tried to start and it wouldn't.
I'd say for now(the quick fix) is use the folded foil around the battery post method to keep the connector and battery post both secured to each other tightly. You shouldn't be able to twist the lead by hand.
ps. if you require help to replace the positive lead connector, I have the hydraulic tool to attach proper connectors if you want. It'd just be a matter of arranging a time to meet to do the job.
I have a Traxide.
No switch on the Traxide
I've had multi meters for decades. I also have a Nanocom. The alternator puts out 14V plus.
Nothing, no lights on dash. The battery was as dead as a dodo. Although twisting the connector did get it to start, once.
I am hoping that there is lead foil at work.
Thanks, I have to chase up a connector.