I usually don't recommend those ones. When a battery is nearly completely flat those cheap ones often fail to detect the battery and start charging. A lot of the Noco line has a force charge state so that it will actually start charging a nearly dead/completely dead battery and they support AGM batteries if you were to ever install one.Now that my better half is no longer going into work every day our car battery has started losing cranking power. It's been cold so it could be that, or it could be that the 6 yr old battery just needs replacing, but I suspect it's caused by us only doing a couple of 10 minute trips / week.
Based on that, I grabbed one of these trickle chargers.
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In theory if it is always plugged in you should never hit that but otherwise you have to jump start a dead or nearly dead AGM battery with another battery to get those ones to kick in and that is just a lot of messing around.